Answer:
To solve this problem, we can use the following formula:
Volume of a pyramid = (1/3) * base area * height
The first step is to calculate the height of the pyramid. Since each side wall makes an angle of 45° with the plane of the base, the height is equal to the length of the altitude of the rhombus. The altitude can be calculated using the Pythagorean theorem:
altitude = sqrt((diagonal/2)^2 - (side/2)^2)
= sqrt((5.4/2)^2 - (4.5/2)^2)
= 2.7 cm
The base area of the pyramid is equal to the area of the rhombus:
base area = (diagonal1 * diagonal2) / 2
= (4.5 * 4.5) / 2
= 10.125 cm^2
Now, we can calculate the volume of the pyramid:
Volume = (1/3) * base area * height
= (1/3) * 10.125 * 2.7
= 9.1125 cm^3
Therefore, the volume of the pyramid is 9.1125 cm^3.
To calculate the area of the pyramid, we need to find the area of each triangular face. Since the pyramid has four triangular faces, we can calculate the total area by multiplying the area of one face by 4. The area of one face can be calculated using the following formula:
area of a triangle = (1/2) * base * height
where base is equal to the length of one side of the rhombus, and height is equal to the height of the pyramid. Since the rhombus is a regular rhombus, all sides have the same length, which is equal to 4.5 cm. Thus, we have:
area of a triangle = (1/2) * 4.5 * 2.7
= 6.075 cm^2
Therefore, the total area of the pyramid is:
area = 4 * area of a triangle
= 4 * 6.075
= 24.3 cm^2
Hence, the area of the pyramid is 24.3 cm^2.
a researcher conducts an experiment comparing two treatment conditions with 10 scores in each treatment condition. how many participants are needed for the study if an independent-measures design is used, if a repeated-measures design is used, and if a matched-subjects design is used?
If an independent-measures design is used, a total of 20 participants would be needed, with 10 participants in each treatment condition.
If a repeated-measures design is used, only 10 participants would be needed since each participant would serve as their own control and be tested in both treatment conditions. If a matched-subjects design is used, the number of participants needed would depend on how many pairs of matched subjects are needed. For example, if 5 pairs of matched subjects are needed, then a total of 10 participants would be needed.
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An investment portfolio is shown below.
Investment
Money Market Account $3,200
Government Bond
$1,750
Preferred Stock
$1,235
Common Stock
$2,300
O 0.5%
O 1.1%
Amount Invested ROR
02.3%
O 3.5%
2.1%
Using technology, calculate the difference between the arithmetic average ROR and the weighted average ROR. Round to
the nearest tenth of a percent.
4.4%
-7.8%
10.5%
Using a calculator, the difference between the arithmetic average ROR and the weighted average ROR is Option B) 0.1%
How did we arrive at this conclusion?arithmetic average ROR is given as
(2.1% + 4.4% - 7.8% + 10.5%) / 4 = 0.02300
The Weighted Average ROR
[(0.021 x 3200 ) + (0.044 x 1750) + (-0.078 x 1235) + (0.105 x 2300)] / (3200 + 1750 + 1235 + 2300) = 0.0341037124337065
Thus:
The Weighted Average ROR - arithmetic average ROR
= 0.0341037124337065 - 0.02300
= 0.01110371243 x 100
= 1.11037124337%
≈ 1.1%
So we are correct to state that Option B is the right answer.
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Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests $3,500 and Z invests $2,000. If the profits are $1,500, how much less does X receive than if the profits were divided in proportion to the amount invested?
Under the equal distribution agreement, X receives $175 less than they would have earned if the earnings were distributed in proportion to their investment.
What is profit?Profit is defined as the amount gained from selling a product that is greater than the cost price of the product.
If the profits were divided in proportion to the amount invested, then X would receive a fraction of the profits equal to the ratio of their investment to the total investment, and similarly for Y and Z. The total investment is:
$4,500 + $3,500 + $2,000 = $10,000
So the fractions of the profits that X, Y, and Z would receive in proportion to their investments are:
X's fraction = $4,500 / $10,000 = 0.45
Y's fraction = $3,500 / $10,000 = 0.35
Z's fraction = $2,000 / $10,000 = 0.2
Multiplying each fraction by the total profits of $1,500 gives the amount of profits that each person would receive if the profits were divided in proportion to their investments:
X's share = 0.45 * $1,500 = $675
Y's share = 0.35 * $1,500 = $525
Z's share = 0.2 * $1,500 = $300
Since the three partners have agreed to divide the profits equally, each person will receive $1,500 / 3 = $500. The difference between what X receives under the equal division agreement and what they would have received if the profits were divided in proportion to their investment is
$675 - $500 = $175
Therefore, X receives $175 less under the equal division agreement than they would have received if the profits were divided in proportion to their investment.
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4x - 2y = -2
-3 + 5y = -9
What is the solution to this system of equations?
The solution of the equation is as follows:
x = -2
y -= 3
How to solve system of equation?The system of equation can be solved using different method such as substitution method, elimination method and graphical method.
Therefore, let's solve equation.
4x - 2y = -2
-3x + 5y = -9
Hence, multiply equation(i) by 2.5
10x - 5y = -5
-3x + 5y = -9
add the equation
7x = -14
divide both sides by 7
x = -14 / 7
x = -2
Therefore,
4(-2) - 2y = -2
-8 - 2y = -2
-2y = -2 + 8
-2y = 6
divide both sides by -2
y = 6 / -2
y = -3
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Help me please and explain im so confused
The value of cos S to the nearest hundredth is 0.54
What is trigonometric ratio?Trigonometric Ratios are defined as the values of all the trigonometric functions based on the value of the ratio of sides in a right-angled triangle.
Sin(tetha) = opp/hyp
cos(tetha) = adj/hyp
tan(tetha) = opp/adj
Here in this triangle, the hypotenuse is 28
and the opposite to angle S is line TU
The adjascent is 15
therefore cos S = adj/hyp
= 15/28
= 0.54 ( nearest hundredth)
therefore the value of cos S is 0.54
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The amount of water on barrel deceased 9 5/8 pints in 7 weeks what was the change of water in 12 weeks
Answer:
To solve this problem, we can use a proportion.
Let x be the change of water in 12 weeks.
We know that in 7 weeks, the water decreased by 9 5/8 pints.
So, we can set up the proportion:
9 5/8 pints / 7 weeks = x / 12 weeks
To solve for x, we can cross-multiply and simplify:
9 5/8 pints * 12 weeks = 7 weeks * x
115 1/2 pints = 7 weeks * x
x = 115 1/2 pints / 7 weeks
x = 16 1/2 pints per 12 weeks
Therefore, the change of water in 12 weeks is 16 1/2 pints.
Step-by-step explanation:
Brody has a jar with 1000 g of sugar in it. Each day, he empties out half
of the sugar that is in the jar. At the end of the first day, he is left with
500 g of sugar.
a) How much sugar will be left in the jar at the end of the 5th day? Give
your answer in grams (g).
b) Write a sentence to explain whether or not the jar will ever be empty
31.25 g on the 5th day
no it will never by empty because even when it gets down to one singular piece of sugar you would technically just cut it in half, then that in half, yes it would get impossible, that's why you wouldn't actually do it, but if you typed it into a calculator it would just keep getting a smaller and smaller decimal.
I need help on this 40 points I need to turn it in in like 5 min
Answer:
Step-by-step explanation:
13. B
14. A
15. D
xon the following graph, use the orange points (square symbol) to plot points along the portion of the firm's short-run supply curve that corresponds to prices where there is positive output.
To plot points along the portion of the firm's short-run supply curve that corresponds to prices where there is positive output, we need to identify the portion of the graph where the firm is producing output.
We can observe from the graph that the firm's short-run supply curve is the component of the marginal cost curve that is higher than the average variable cost curve. The company will shut down and create no production if prices fall below the minimum point of the average variable cost curve. However, as long as the price is above the marginal cost of production, the company will create output at prices above the minimum point of the average variable cost curve.
We may use the orange square symbols to represent the price and matching amount provided at each point where the company is generating output to plot points along this segment of the short-run supply curve. We may advance up the marginal cost curve from the last point of the average variable cost curve until we reach the maximum price at which the company is generating output. The firm's short-run supply curve may then be created by marking each price and quantity combination along this segment of the curve.
It is important to note that the firm's short-run supply curve is a reflection of its marginal cost curve above the average variable cost curve, and will shift as the firm's costs of production change or its technology improve.
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if he sees a wolf, a boy will cry wolf with probability 0.8. if he does not see a wolf, the boy will cry wolf anyway with probability 0.4. if the probability that there is a wolf would otherwise be 0.25, what is the probability that there really is a wolf when the boy crys wolf?
The probability that there really is a wolf when the boy cries wolf is 0.54.
Let A be the event that the boy cries wolf and B be the event that there is a wolf. We are given the following probabilities:
P(A|B) = 0.8 (the probability that the boy cries wolf when there is a wolf)
P(A|B') = 0.4 (the probability that the boy cries wolf when there is no wolf)
P(B) = 0.25 (the probability that there is a wolf)
We want to find P(B|A), the probability that there really is a wolf given that the boy cries wolf.
We can use Bayes' theorem to calculate this:
P(B|A) = P(A|B) * P(B) / [P(A|B) * P(B) + P(A|B') * P(B')]
Substituting the given values, we get:
P(B|A) = 0.8 * 0.25 / [0.8 * 0.25 + 0.4 * 0.75] = 0.54
Therefore, the probability that there really is a wolf when the boy cries wolf is 0.54.
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1. Write the set of strings in the language L given by
L = {x | x ∈ L(0∗1∗)∧|x| = 4∧∃y ∈ {0,1} : ∃z ∈ {0,1}∗ : x = y1z}.
Note: it is intentional that y’s set does not have an asterisk but z’s set does.
2. Let Σ = {a,b,c}. Write a regular expression which can generate the language that has
odd number of a’s, even number of b’s and a single c character.
Which generates strings that start and end with a single b character, have an odd number of a's (at least one and then multiples of two), and have any number of additional b's in between.
The language L can be described as follows:
L = {x | x is a string of length 4 that starts with either 0 or 1, and can be written as y1z where y is either 0 or 1, and z is any string of 0's and 1's}
In other words, L is the set of all strings of length 4 that start with either 0 or 1, have a 1 as the second character, and can be written as the concatenation of a single bit y and any string z of 0's and 1's.
Formally:
L = {0 1 z | z ∈ {0,1}∗} ∪ {1 1 z | z ∈ {0,1}∗} ∪ {1 0 z | z ∈ {0,1}∗} ∪ {0 0 z | z ∈ {0,1}∗}
A regular expression that generates the language with odd number of a's, even number of b's and a single c character can be constructed as follows:
((bb)a(aaa)(bb)c)|((bb)c(aa)(bb))|((aaa)(bb)c(bb))
This expression consists of three parts separated by vertical bars.
The first part generates strings that start with an even number of b's, have an odd number of a's (at least one and then multiples of two), and end with a single c character. The second part generates strings that start with an even number of b's, followed by a single c character and some even number of a's. The third part generates strings that start with an odd number of a's (at least one and then multiples of two), followed by some even number of b's, and end with a single c character.
Note that the expression can be simplified if we assume that the language must contain at least one b character. In this case, the first part of the expression becomes:
(b*(abab)*c)
which generates strings that start and end with a single b character, have an odd number of a's (at least one and then multiples of two), and have any number of additional b's in between.
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1.What does the series
[infinity]
Σ √n/n²
n=1
tell us about the convergence or divergence of the series
[infinity]
Σ √n/n²+n+3
n=1
2.
What does the series
[infinity]
Σ πn/n
n=1
tell us about the convergence or divergence of the series
[infinity]
Σ πn+√n/3n+n²
n=1
1. To determine the convergence or divergence of the series Σ(√n/n² + n + 3) from n=1 to infinity, let's first consider the series Σ(√n/n²) from n=1 to infinity.
Using the Comparison Test, we can compare Σ(√n/n²) with Σ(1/n), which is a known harmonic series and diverges. Since (√n/n²) ≤ (1/n) for all n ≥ 1, and Σ(1/n) diverges, Σ(√n/n²) also diverges.
Now, Σ(√n/n² + n + 3) can be rewritten as Σ(√n/n²) + Σ(n) + Σ(3). Since Σ(√n/n²) diverges, the whole series Σ(√n/n² + n + 3) diverges as well.
2. To determine the convergence or divergence of the series Σ(πn + √n)/(3n + n²) from n=1 to infinity, let's consider the series Σ(πn/n) from n=1 to infinity.
Using the Comparison Test again, we compare Σ(πn/n) with Σ(1/n). Since (πn/n) ≥ (1/n) for all n ≥ 1, and Σ(1/n) diverges, Σ(πn/n) also diverges.
Now, Σ(πn + √n)/(3n + n²) can be compared with Σ(πn/n). Since (πn + √n)/(3n + n²) ≤ (πn/n) for all n ≥ 1, and Σ(πn/n) diverges, the series Σ(πn + √n)/(3n + n²) diverges as well.
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Which of the following is not a valid probability
A. 1
B. 1.1
C. 0
D. 0.001
Answer:
B
Step-by-step explanation:
It is impossible for a possibility to be more than 1, or 100%.
Discuss how statistics led to the development of computer systems and how computer systems led to the development of statistics.
Statistics and computer systems have a mutually beneficial relationship that has contributed to significant advancements in both fields. The use of statistics has played a crucial role in the development of computer systems, while computer systems have greatly impacted the field of statistics.
Statistics has been instrumental in the development of computer systems by providing a framework for data analysis and interpretation. Without statistics, computers would not be able to process and analyze large amounts of data efficiently. For example, statistical models and algorithms are used in machine learning and artificial intelligence to enable computers to learn and make decisions based on data. Additionally, statistics is used to test and validate the effectiveness of computer systems, ensuring that they are reliable and accurate.
On the other hand, computer systems have revolutionized the field of statistics by making data analysis faster and more accurate. With the availability of powerful computers, statisticians can analyze and interpret large datasets more quickly and accurately, leading to new insights and discoveries. Computer systems have also enabled the development of sophisticated statistical software and tools, making statistical analysis more accessible to a wider audience.
In conclusion, the relationship between statistics and computer systems has been symbiotic, with each field contributing to the growth and advancement of the other. The use of statistics has led to the development of sophisticated computer systems, while computer systems have greatly impacted the field of statistics, making data analysis faster and more accurate.
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According to a poll of adults, about 46% work during their summer vacation. Assume that the true proportion of all adults that work during summer vacation is p=0.46. Now consider a random sample of 400 adults. Complete parts a and b below.
a. What is the probability that between 39% and 53% of the sampled adults work during summer vacation?
The probability is. (Round to three decimal places as needed.)
b. What is the probability that over 63% of the sampled adults work during summer vacation?
The probability is (Round to three decimal places as needed.)
To find the probability we do the following:
Beth enlarged the triangle below by a scale of 5.
3.5 cm
4 cm
She found the area of the enlarged triangle. Her work is shown below.
(4)(3.5)(5)- 35 cm²
What was Beth's error?
O She should have divided (4)(3.5) by 5.
Caus and Exit
The error made by Beth is that:
She didn't apply the scale factor to each dimension of the triangle before multiplying
How to Interpret Enlargement Scale Factor?We are given the parameters as:
Initial height = 3.5cm
Initial width = 4cm
Formula for area of triangle is:
Area = ¹/₂ * base * height
If the triangle was enlarged by a scale factor of 5, then it means each of the dimensions should first be multiplied by 5 to get:
New width = 4 * 5 = 20 cm
New height = 5 * 3.5 = 17.5 cm
Thus:
New area = ¹/₂ * 20 * 17.5 = 175 cm²
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At a local gym with 800 members, 450 members take aerobics class, 200 members do weight training, and 125 members do both weight training and take an aerobics class. What is the probability that a randomly-selected member takes an aerobics class or does weight training? Round your answer to the hundredths place.
Answer:
0.66
Step-by-step explanation:
You want the probability that a randomly chosen member from the 800 members of a gym takes either an aerobics class, as 450 members do, or does weight training, as 200 members do. 125 members do both.
EitherAdding the numbers given for members who do aerobics or weight training will count the number who do both twice. Then the number who do either is ...
(# of aerobics) + (# of weights) - (# of both)
= 450 +200 -125 = 525
The probability that one of the 800 members is in this group is ...
P(either) = 525/800 ≈ 0.66
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Find the coordinate vector of v relative to the basis S = (v1, V2, V3) for R^3 v = (40,36, 24); v1 = (2,0,0), v2 = (3,3,0), v3 = (8, 8, 8)
(v)s = ___ , ____, ____
To find the coordinate vector of v relative to the basis S = (v1, v2, v3) for R^3 with v = (40, 36, 24), v1 = (2, 0, 0), v2 = (3, 3, 0), and v3 = (8, 8, 8), follow these steps:
1. Write v as a linear combination of the basis vectors v1, v2, and v3: v = a * v1 + b * v2 + c * v3
2. Substitute the given vectors: (40, 36, 24) = a * (2, 0, 0) + b * (3, 3, 0) + c * (8, 8, 8)
3. This results in a system of linear equations:
2a + 3b + 8c = 40
3b + 8c = 36
8c = 24
4. Solve the system of linear equations:
From the third equation, we can find c: c = 24 / 8 => c = 3
Substitute c into the second equation: 3b + 8 * 3 = 36 => 3b + 24 = 36 => 3b = 12 => b = 4
Substitute b and c into the first equation: 2a + 3 * 4 + 8 * 3 = 40 => 2a + 12 + 24 = 40 => 2a = 4 => a = 2
So, the coordinate vector of v relative to the basis S is (a, b, c) = (2, 4, 3). Therefore, (v)s = (2, 4, 3).
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A system uses three components. Each component has probably 0.10 of toning, and the components that dependerity. What is the packability that we cre component works a. 0.001 b. 0.999 c. 0.900 d. 0.729
A system uses three components, with each component having a probability of 0.10 of toning, and the components have dependerity. To find the packability that at least one component works, we can use the following steps:
1. Calculate the probability that a component fails: 1 - probability of toning = 1 - 0.10 = 0.90
2. Since the components have dependerity, we can multiply the probability of failure for each component: 0.90 * 0.90 * 0.90 = 0.729
3. To find the packability that at least one component works, we can subtract the probability that all components fail from 1: 1 - 0.729 = 0.271
So, the packability that at least one component works is approximately 0.271, which is not listed in the given options.
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Solve using the zero product property. The problem has been factored for you.
The solution is, the solutions using the Zero Product Property: is x =0 and -5.
The expression to be solved is:
x(x + 5) = 0
we know that,
The zero product property states that the solution to this equation is the values of each term equals to 0.
now, we have,
x (x + 5) = 0
i.e. we get,
(x) × (x + 5) = 0
so, using the Zero Product Property:
we get,
(x) = 0
or,
(x + 5) = 0
so, we have,
x = 0 or, x = -5
The answers are 0 and -5.
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NEED ANSWERS ASAP!! PLS
The US government monitors the consumption of different products. The table shows y, the amount of ice cream consumed, in millions of pounds, for * years since 2010. The quadratic equation that models the amount of ice cream consumed, in millions of pounds, since 2010 is shown. y = 12(¢ - 6)2 + 3922 Determine when the amount of ice cream consumed in the United State would be 5,650 millions of pounds.
The amount of ice cream consumed in the United State would be 5,650 millions of pounds in 2028.
How to determine when the amount of ice cream is 5,650 millions of pounds?Based on the information provided about the mount of ice cream consumed in the United State, a quadratic equation that models the amount of ice cream consumed, in millions of pounds, since 2010 is given by;
y = 12(x - 6)² + 3922
Where:
y is the amount of ice cream consumed, in millions of pounds.x is the number of years since 2010.By substituting the value of y, the number of years can be calculated as follows;
5,650 = 12(x - 6)² + 3922
5,650 - 3922 = 12(x - 6)²
1728 = 12(x - 6)²
144 = (x - 6)²
12 = x - 6
x = 12 + 6
x = 18 years.
Since 2010; 2010 + 18 = 2028.
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What percentage of the area under the normal curve is to theleft of the following z-score? Round your answer to two decimalplaces.z=−2.08
1.88% of the area under the normal curve is to the left of the z-score -2.08.
To find the percentage of the area under the normal curve to the left of the given z-score (z = -2.08), you can use a z-table or an online calculator.
Using a z-table, find the value corresponding to z = -2.08.
The value you will find is 0.0188. This value represents the area under the curve to the left of the z-score. To express this as a percentage, we multiply it by 100:
0.0188 * 100 = 1.88%
Therefore, approximately 1.88% of the area under the normal curve is to the left of the z-score -2.08.
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A store sells used and new video games. New video games cost more than uses ones.all used video games cost the same. All new video games cost the same.
Brayne can purchase 5 used video games after the purchase of 3 new video games.
Let us assume
Cost of each used video game = x
Cost of each new video game = y
Now, Yafreisy spent a total of $84 on 4 used video games and 2 new video games.
4x+ 2y = 84......(i)
and, Ashley spent a total of $78 on 6 used video games and 1 new video game.
6x + y = 78......(ii)
Solving equation (1) and (2) we get
x=9 and y= 24
Thus, Byran can purchase
= 48/9
= 5.4
Therefore, Brayne can purchase 5 used video games after the purchase of 3 new video games.
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The Question attached here seems to be incomplete, the complete question is:
A store sells used and new video games. New video games cost more than used video games. All used video games cost the same and all new video games also cost the same. Yafreisy spent a total of $84 on 4 used video games and 2 new video games. Ashley spent a total of $78 on 6 used video games and 1 new video game. Brayan has $120 to spend. How many used video games can Brayan purchase after purchasing 3 new video games?
use law of sines to solve triangle with B=52 C=15 b=43
Using the Law of Sines, we can solve the given triangle with B = 52, C = 15, and b = 43. The three angles of the triangle are approximately A = 112.94°, B = 52°, and C = 15°, and the lengths of the sides opposite these angles are approximately a = 28.29, b = 43, and c = 8.11.
The Law of Sines states that in any triangle, the ratio of the length of a side to the sine of its opposite angle is the same for all sides and their opposite angles. Therefore, we can use the Law of Sines to solve the given triangle as follows
sin(A)/a = sin(B)/b = sin(C)/c
We are given B = 52, C = 15, and b = 43, so we can use the Law of Sines to find a
sin(A)/a = sin(B)/b
sin(A)/a = sin(52)/43
sin(A) = a sin(52)/43
a = 43 sin(A)/sin(52)
Similarly, we can use the Law of Sines to find c
sin(A)/a = sin(C)/c
sin(A)/a = sin(15)/c
sin(15)c = a sin(A)
c = a sin(A)/sin(15)
Now, we can substitute the expressions for a and c into the equation sin(A)/a = sin(B)/b and solve for sin(A)
sin(A)/(43 sin(A)/sin(52)) = sin(52)/43
sin(A) = (43 sin(52) sin(15))/c
Substituting the expression for c, we get
sin(A) = (43 sin(52) sin(15))/(a sin(A)/sin(15))
Simplifying, we get
sin²(A) = (43²sin²(52) sin²(15))/(a²sin²(A))
Multiplying both sides by a^2 sin^2(A), we get
a²sin⁴(A) = 43^2 sin²(52) sin²(15)
Taking the square root of both sides and solving for a, we get
a = √((43² sin₂(52) sin²(15))/(sin⁴A)))
Substituting the given values and solving for A, we get
a = 28.29 (approx)
A = 112.94° (approx)
c = 8.11 (approx)
Therefore, the three angles of the triangle are approximately A = 112.94°, B = 52°, and C = 15°, and the lengths of the sides opposite these angles are approximately a = 28.29, b = 43, and c = 8.11.
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P=800 , r=6% , t=9 years compounded monthly
The final amount after 9 years on a sum of $800 at 6% per annum compounded monthly is $1370.
The "Compound-Interest" refers to the interest earned on both the principal amount and the accumulated interest from previous periods, resulting in exponential growth over time.
To calculate the compound interest earned for a principal amount "P", an annual interest rate "r", and a time period of "t" years compounded n times per year, we use the following formula: [tex]A = P(1 + \frac{r}{n} )^{nt}[/tex],
where A is "final-amount" after "t" years,
In this case, the principal amount "P" is $800,
The "annual-interest-rate" (r) is = 6%, and the time period "t" is 9 years.
The interest is compounded monthly, which means n = 12 (12 months in a year).
Substituting the values,
We get,
⇒ A = 800(1 + 0.06/12)¹²ˣ⁹,
⇒ A = 800(1 + 0.005)¹⁰⁸,
⇒ A = 800 × (1.005)¹⁰⁸,
⇒ A ≈ 1370,
Therefore, the total amount after 9 years is approximately $1370.
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The given question is incomplete, the complete question is
Find the final amount after 9 years for P=800 , r=6%, compounded monthly.
pls help ASAP 20 points
Answer:
A. Bay Side: mean = 17.1, median = 16; Seaside: mean = 19.5, median = 18
B. Bay Side: σ = 8.96, IQR = 12, range = 37; Seaside: σ = 9.03, IQR = 16, range = 31
C. Bay Side has lower center values and less variation.
Step-by-step explanation:
Given stem and leaf plots for 15 class sizes at each of two schools, you want to know (a) their measures of center, (b) their measures of variation, and (c) which would be preferred for lower class size.
A. CenterThe first attachment shows the statistics for Bay Side School. It tells you the measures of center for Bay Side are ...
Mean: 17.1Median: 16The second attachment shows the statistics for Seaside School. The measures of center there are ...
Mean: 19.5Median: 18We note the measures of center indicate smaller classes at Bay Side.
B. VariationFor Bay Side School, the measures of variation are ...
Standard deviation: 8.96IQR: 22 -10 = 12Range: 42 -5 = 37; with outlier removed, 25 -5 = 20For Seaside School, the measures of variation are ...
Standard deviation: 9.03IQR = 27 -11 = 16Range: 36 -5 = 31The measures of variation are generally smaller for Bay Side.
C. Smaller ClassesThe measures of center and the measures of variation both favor Bay Side School as the school of choice for smaller classes.
__
Additional comment
The arithmetic for these descriptive statistics can be tedious and error-prone. It is convenient to let a calculator do it. The lists of data points are given as L1 and L2 for the calculator screens attached. L1 is Bay Side data, and the result of the 1-Var Stats calculation is shown in the first attachment. Seaside data was put in L2, which was used for the calculations shown in the second attachment.
The Q1 and Q3 data values are the 4th lowest and 4th highest data values in each of the lists. The median is the 8th data value, counted from either end.
<95141404393>
a random sample of 25 customers for lunch at a local restaurant stayed an average of 45 minutes with a standard deviation of 10 minutes. another random sample of 30 customers for dinners at this restaurant stayed an average of 55 minutes with a standard deviation of 15 minutes. determine a 95% confidence interval for the difference of the mean time that the customers stayed for lunch and for dinner.
A 95% confidence interval for the difference of the mean time that the customers stayed for lunch and for dinner is between -17.34 and -2.66 minutes.
To calculate the confidence interval for the difference of the mean time that the customers stayed for lunch and dinner, we can use the formula:
CI = (x1 - x2) ± tα/2 * SE
where:
x1 and x2 are the sample means for lunch and dinner, respectively
tα/2 is the t-score for the desired level of confidence and degrees of freedom (df)
SE is the standard error of the difference between the sample means, calculated as:
SE = √(s1²/n1 + s2²/n2)
where:
s1 and s2 are the sample standard deviations for lunch and dinner, respectively
n1 and n2 are the sample sizes for lunch and dinner, respectively
Given the information in the problem, we have:
x1 = 45 minutes
x2 = 55 minutes
s1 = 10 minutes
s2 = 15 minutes
n1 = 25 customers for lunch
n2 = 30 customers for dinner
α = 0.05/2 (since we want a 95% confidence interval and the distribution is two-tailed)
df = n1 + n2 - 2 = 53 (approximated using the smaller sample size)
First, let's calculate the standard error of the difference between the sample means:
SE =√(s1²/n1 + s2²/n2)
= √(10²/25 + 15^2/30)
= 3.6515
Next, let's calculate the t-score for α/2 = 0.025 and df = 53:
tα/2 = ±2.009 (using a t-table or calculator)
Finally, we can calculate the confidence interval:
CI = (x1 - x2) ± tα/2 * SE
= (45 - 55) ± 2.009 * 3.6515
= -10 ± 7.34
= (-17.34, -2.66)
Therefore, we can say with 95% confidence that the true difference in the mean time that customers stayed for lunch and for dinner is between -17.34 and -2.66 minutes.
Since the interval does not include zero, we can conclude that there is a significant difference in the mean time that customers stayed for lunch and for dinner. Specifically, customers tend to stay longer for dinner compared to lunch.
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Determine whether the sequence is divergent or convergent. If it is convergent, evaluate its limit. (If it diverges to infinity, state your answer as inf. If it diverges to negative infinity, state your answer as -inf. If it diverges without being infinity or negative infinity, state your answer as div )limn→[infinity] −8n6+sin2(7n)/n7+9
The sequence converges to 0.
To determine the convergence or divergence of the given sequence, we can use the limit comparison test.
Let's consider the series a_n = -8n^6 + sin^2(7n) and b_n = n^7 + 9.
Since sin^2(7n) is always between 0 and 1, we have 0 ≤ sin^2(7n) ≤ 1 for all n. Therefore,
-8n^6 ≤ -8n^6 + sin^2(7n) ≤ -7n^6
Dividing all terms by n^7 + 9, we get
-8n^-1/(n^7+9) ≤ (-8n^6 + sin^2(7n))/(n^7 + 9) ≤ -7n^-1/(n^7+9)
Now, taking the limit as n approaches infinity, we have
lim n→∞ -8n^-1/(n^7+9) = 0
lim n→∞ -7n^-1/(n^7+9) = 0
Since both the upper and lower bounds go to 0, the limit comparison test tells us that the series a_n and b_n have the same convergence behavior.
Since the series b_n = n^7 + 9 is a p-series with p = 7 > 1, it converges. Therefore, the given sequence
(-8n^6 + sin^2(7n))/(n^7 + 9)
also converges by the limit comparison test.
To evaluate its limit, we can use algebraic manipulation and the squeeze theorem.
-8n^6 ≤ -8n^6 + sin^2(7n) ≤ -7n^6
Dividing all terms by n^7 + 9 and taking the limit as n approaches infinity, we get
lim n→∞ (-8n^6)/(n^7 + 9) ≤ lim n→∞ (-8n^6 + sin^2(7n))/(n^7 + 9) ≤ lim n→∞ (-7n^6)/(n^7 + 9)
Using the squeeze theorem, we know that
lim n→∞ (-8n^6)/(n^7 + 9) = lim n→∞ (-7n^6)/(n^7 + 9) = 0
Therefore,
lim n→∞ (-8n^6 + sin^2(7n))/(n^7 + 9) = 0
Hence, the sequence converges to 0.
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A softball is thrown at an angle of 45° with an initial speed of 49 ft/s and an initial height
of 5 ft.
i) Write a set of parametric equations for the motion of the softball.
ii) Determine how long the softball was in the air.
iii) Determine how far the softball traveled in the air.
iv) Determine when the softball reached its maximum height.
v) Determine the maximum height reached by the softball.
Answer:
i) The horizontal and vertical components of the softball's motion can be described by the following parametric equations:
x(t) = v0x * t
y(t) = v0y * t - 1/2 * g * t^2 + h0
where v0x and v0y are the initial horizontal and vertical velocities, respectively, g is the acceleration due to gravity (32.2 ft/s^2), h0 is the initial height (5 ft), and t is time.
We can find v0x and v0y by resolving the initial velocity vector into horizontal and vertical components:
v0x = v0 * cos(45°) = 49 ft/s * cos(45°) ≈ 34.65 ft/s
v0y = v0 * sin(45°) = 49 ft/s * sin(45°) ≈ 34.65 ft/s
Substituting these values into the parametric equations, we get:
x(t) = 34.65 * t
y(t) = 34.65 * t - 16.1 * t^2 + 5
ii) The softball will be in the air until it hits the ground, which occurs when y(t) = 0. We can solve for t using the quadratic formula:
16.1 * t^2 - 34.65 * t + 5 = 0
t ≈ 2.19 s (rounded to two decimal places)
Therefore, the softball was in the air for approximately 2.19 seconds.
iii) The horizontal distance traveled by the softball can be found by evaluating x(t) at the time when the softball hits the ground:
x(2.19) ≈ 75.8 ft (rounded to one decimal place)
Therefore, the softball traveled approximately 75.8 feet in the air.
iv) The softball reaches its maximum height when its vertical velocity is zero. We can find the time when this occurs by setting v0y - g * t = 0 and solving for t:
t = v0y / g = 34.65 / 32.2 ≈ 1.08 s (rounded to two decimal places)
Therefore, the softball reaches its maximum height after approximately 1.08 seconds.
v) The maximum height reached by the softball can be found by evaluating y(t) at the time when the softball reaches its maximum height:
y(1.08) ≈
Step-by-step explanation:
Vectors u = 6(cos 60°i + sin60°j), v = 4(cos 315°i + sin315°j), and w = −12(cos 330°i + sin330°j) are given. Use exact values when evaluating sine and cosine.
Part A: Convert the vectors to component form and find −7(u • v). Show every step of your work. (4 points)
Part B: Convert the vectors to component form and use the dot product to determine if u and w are parallel, orthogonal, or neither. Justify your answer. (6 points)
PART A: component form of the vector is:
u = <3, 3√3>
v = <2√2, -2√2>
w = <-6√3, 6>
-7(u • v) = 42(√6 - √2)
PART B: u and w are orthogonal
How to write vectors in component form?The component form of a vector is <x, y>.
PART A:
u = 6(cos 60°i + sin60°j)
x = 6(cos 60) = 6 * 1/2 = 3
y = 6(sin 60) = 6 * (√3)/2 = 3√3
In component form, u = <3, 3√3>
v = 4(cos 315°i + sin315°j)
x = 4(cos 315°) = 4 * (√2)/2 = 2√2
y = 4(sin 315°) = 4 * (-√2)/2 = -2√2
v = <2√2, -2√2>
w = −12(cos 330°i + sin330°j)
x = -12(cos 330°) = -12 * (-1/2) = -6√3
y = -12(sin 330°) = -12 * (√3)/2 = 6
w = <-6√3, 6>
The dot product of two vectors is given by:
A•B = A[tex]_{x}[/tex]B[tex]_{x}[/tex] + A[tex]_{y}[/tex]B[tex]_{y}[/tex]
−7(u • v) = -7 * [(3 * 2√2) + (3√3 * -2√2)]
= -7 * [6√2 - 6√6]
= 42(√6 - √2)
Part B:
The vectors will be parallel if the dot product is equal to the product of the magnitudes which means the angle between the vectors is 0 or 180.
The vectors will be orthogonal if the dot product = 0. This means the angle between them = 90.
The dot product of the vectors (u) and (w) will be as follows:
u = <3, 3√3>
w = <-6√3, 6>
u • w = (3 * -6√3) + (3√3 * 6)
= -18√3 + 18√3
= 0
Since the result of the dot product = 0. The vectors (u) and (w) are orthogonal.
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