a. Let A and B be invertible matrices with det then, det(A⁻¹B⁻¹) = -1/24
b. Let A and B be invertible matrices with det then, det(2A) = -96
The matrices are two-dimensional collections of symbols or numbers that are dispersed in a rectangular pattern along vertical and horizontal lines, arranging their constituent parts in rows and columns. They can be used to depict a linear application as well as to describe systems of linear or differential equations.
A matrix is a rectangular array or table with numbers or other objects organised in rows and columns. Matrices is the plural version of matrix. The number of columns and rows is unlimited. A matrix, sometimes known as matrices, is a rectangular array or table of letters, numbers, or other symbols organised in rows and columns that is used to represent a mathematical object or a characteristic of one.
(a) det(A⁻¹B⁻¹)
= (det A)⁻¹(det B)⁻¹
= (-3)⁻¹(8)⁻¹
det(A⁻¹B⁻¹) = -1/24
(b) det(2A)
= 2⁵(det A)
= 2⁵(-3)
det(2A) = -96
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how much time do americans spend eating or drinking? suppose for a random sample of 1001 americans, the mean time eating or drinking per day is 1.22 hours with a sample standard deviation of 0.65 hours. (a) construct and interpret a 99% confidence interval for the mean amount of time americans spend eating or drinking per day. (b) suppose you want to conduct your own survey. using the sample standard deviation above, how large of a sample is required to estimate the mean time americans spend eating or drinking per day within 15 minutes of the true mean and with 95% confidence?
a. we are 99% confident that the true population mean time Americans spend eating or drinking per day falls between 1.166 and 1.274 hours.
b. There will be 70 sample is required to estimate the mean time Americans spend eating or drinking per day within 15 minutes of the true mean and with 95% confidence
(a) To construct a 99% confidence interval for the mean time Americans spend eating or drinking per day, we can use the formula:
CI = x ± z*(σ/√n)
where x is the sample mean, σ is the population standard deviation (which is unknown, so we use the sample standard deviation), n is the sample size, and z* is the critical value for a 99% confidence interval (which we can find using a table or calculator).
Plugging in the values given, we get:
CI = 1.22 ± 2.58*(0.65/√1001) ≈ 1.22 ± 0.054
So the 99% confidence interval for the mean time Americans spend eating or drinking per day is (1.166, 1.274) hours.
We can interpret this interval as saying that we are 99% confident that the true population mean time Americans spend eating or drinking per day falls between 1.166 and 1.274 hours.
(b) To find the sample size required to estimate the mean time Americans spend eating or drinking per day within 15 minutes of the true mean with 95% confidence, we can use the formula:
n = (z*σ/E)^2
where E is the margin of error (which is 15 minutes = 0.25 hours), z* is the critical value for a 95% confidence interval (which is 1.96), and σ is the sample standard deviation (which is 0.65).
Plugging in the values given, we get:
n = (1.96*0.65/0.25)^2 ≈ 69.88
So we need a sample size of at least 70 to estimate the mean time Americans spend eating or drinking per day within 15 minutes of the true mean with 95% confidence.
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A math textbook has a length of 22 cm, a width of 27 cm, and a height of 3.5
cm. A science textbook has a length of 21 cm, a width of 27 cm, and a height
of 4 cm.
Which textbook has a greater volume?
OA. The science textbook, with a volume of 2376 cm³
OB. The math textbook, with a volume of 2464 cm³
OC. The math textbook, with a volume of 2079 cm³
OD. The science textbook, with a volume of 2268 cm³
The science textbook has a greater volume than the math textbook, so option D is correct, the science textbook, with a volume of 2268 cm³.
The volume of a rectangular prism is given by the formula V = lwh, where l is the length, w is the width, and h is the height.
Using this formula, we can calculate the volumes of the math and science textbooks:
Math textbook:
V = 22 cm × 27 cm × 3.5 cm
= 2079 cm³
Science textbook:
V = 21 cm × 27 cm × 4 cm
= 2268 cm³
Therefore, the science textbook has a greater volume than the math textbook, so option D is correct, the science textbook, with a volume of 2268 cm³.
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Show that the function f(x)= 1 3x3−2x2 7x has no relative extreme points. Relative extreme points exist when____f'(x)=0 or f''(x)=0___. In this case, because _f'(x) or f''(x)____=_____. ____has no x-int, has no y-int, has multiple x-int, has multiple y-int____ the function f(x)=2/3x^3-4x^2+10x has no relative extreme points
The f'(x) has two x-intercepts, but f''(x) is always positive, indicating that f(x) has no relative extrema. This means that the function is either always increasing or always decreasing, and there are no maximum or minimum points.
The function f(x) =
[tex](1/3)x^3 - (2/7)x^2 - 1x[/tex]
has no relative extreme points. To find the relative extreme points of a function, we need to find the critical points where either the derivative f'(x) is equal to zero or the second derivative f''(x) is equal to zero.
Taking the derivative of f(x), we get f'(x) = x^2 - (4/7)x - 1. Setting f'(x) equal to zero and solving for x, we get x =
[tex](2 ± \sqrt{} (30))/7[/tex]
Upon further analysis of the second derivative f''(x) = 2x - (4/7), we see that it is always positive for all values of x.
There are no relative extreme points as the function f(x) does not have any points where the slope is zero and the curvature changes from positive to negative or vice versa.
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For a list size of 1000, on average, the sequential search makes about ____________________ key comparisons.500100250400
For a list size of 1000, the sequential search would make about 500 key.
The sequential search algorithm searches a list item by item until the desired item is found or the end of the list is reached. On average, for a list size of 1000, the sequential search would make about 500 key comparisons. Therefore, the correct answer is 500.
Here's a concise description of the sequential search algorithm:
1.Start at the beginning of the list.
2.Compare the target value with the current element.
3.If they match, return the current position.
4.If they don't match, move to the next element.
5.Repeat steps 2-4 until the target is found or the end of the list is reached.
If the target is not found, return a designated value (e.g., -1) to indicate its absence.
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An elementary teacher wants to know if the school has a higher proportion of left-handed students than the usual proportion of 0.10. The teacher surveys a random sample of 50 students, and finds that 7 are left-handed. 1) What is the sample proportion ? O 0.14 O 0.10 07 2) What is the hypothesized proportion po? O 0.14 O 0.5 O 0.10 3) What is the sample size n? O 50 O 7 4) What is the test statistic z? O 0.943 0 -0.815
1) The sample proportion is 0.14 (7 left-handed students out of 50 total students surveyed).
2) The hypothesized proportion po is 0.10 (the usual proportion of left-handed students).
3) The sample size n is 50 (the number of students surveyed).
4) The test statistic z is 1.32.
1) The sample proportion is calculated by dividing the number of left-handed students by the total number of students surveyed. In this case, 7 left-handed students out of 50 gives a sample proportion of 7/50 = 0.14.
2) The hypothesized proportion (p₀) is the usual proportion of left-handed students, which is given as 0.10.
3) The sample size (n) is the total number of students surveyed, which is 50.
4) The test statistic (z) can be calculated using the formula: z = (sample proportion - hypothesized proportion) / sqrt((hypothesized proportion * (1 - hypothesized proportion)) / sample size). In this case, z = (0.14 - 0.10) / sqrt((0.10 * (1 - 0.10)) / 50) = 0.04 / sqrt(0.09 / 50) ≈ 0.943.
To calculate the test statistic z, we use the formula:
z = (sample proportion - hypothesized proportion) / standard error
The standard error is calculated as:
standard error = sqrt((po * (1-po)) / n)
Plugging in the values, we get:
standard error = sqrt((0.10 * (1-0.10)) / 50) = 0.0499
Then,
z = (0.14 - 0.10) / 0.0499 = 1.32
Since the calculated z-value of 1.32 is greater than the critical value of 1.645 (using a significance level of 0.05 for a two-tailed test), we can conclude that there is not enough evidence to reject the null hypothesis that the proportion of left-handed students at the school is the same as the usual proportion of 0.10.
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(PART A)The general form of a circle is given as
x^2+y^2+4x-12y+4=0.
(a) What are the coordinates of the center of the circle?
(b) What is the length of the radius of the circle?
Answer:
(PART B)
A 10-foot ladder placed on level ground leans against the side of a house. The ladder reaches a point that is 9.2 feet up on the side of the house.
(a) What is the measure of the angle formed by the ladder and the level ground? Round your answer to the nearest degree. Show your work.
(b) The Occupational Safety and Health Administration (OSHA) sets standards for a variety of occupations to help prevent accidents and other safety hazards. OSHA’s standard for the angle formed by a ladder and level ground is 75°. The same 10-foot long ladder is placed against the building according to OSHA’s safety standard.
What is the distance between the foot of the ladder and the foot of the building? Round your answer to the nearest tenth. Show your work.
Answer:
The distance between the foot of the ladder and the foot of the building is 2.6 ft
How to solvePart 1) The general form of a circle is given as x²+y² +4x - 12y + 4 = 0.
(a)What are the coordinates of the center of the circle?
(b)What is the length of the radius of the circle?
x²+y² +4x - 12y + 4 = 0
Group terms that contain the same variable, and move the constant to the opposite side of the equation
(x²+4x)+(y²- 12y)=-4
Complete the square twice. Remember to balance the equation by adding the same constants to each side
(x²+4x+4)+(y²- 12y+36)=-4+4+36
Rewrite as perfect squares
(x+2)²+(y-6)²=36--------> (x+2)²+(y-6)²=6²
center (-2,6)
radius 6
the answer Part a) is
the center is the point (-2,6)
the answer Part b) is
the radius is 6
Part 2)
see the picture attached N 1 to better understand the problem
we know that
sin ∅=opposite side angle ∅/hypotenuse
opposite side angle ∅=9.2 ft
hypotenuse=10 ft
so
sin ∅=9.2/10-----> 0.92
∅=arc sin (0.92)------> ∅=66.93°-----> ∅=67°
the answer Part a) is
67°
Part b)
see the picture attached N 2 to better understand the problem
cos 75=adjacent side angle 75/hypotenuse
adjacent side angle 75=AC
hypotenuse=10 ft
so
cos 75=AC/10---------> AC=10*cos 75----> AC=2.59 ft----> AC=2.6 ft
the answer Part B) is
The distance between the foot of the ladder and the foot of the building is 2.6 ft
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4. The image below is a cube. Edge BC is along the x-axis. Edge BA is along the y-axis. Edge BF
is along the z-axis. What are the coordinates of point G?
E
F
3
2
Bo 1
D
In order to precisely locate a point, you must identify its location relative to a coordinate system.
How to find the coordinates of a pointThis system assigns numerical values to points in space and is thus equipped to uniquely pinpoint any position.
Firstly, ascertain the distance from the point to the coordinate system's origin.
Applying this knowledge to a Cartesian-style grid, consider both the horizontal (x-coordinate) as well as vertical (y-coordinate) distances between the specified point and the origin.
Finally, render the coordinates of the target point in the correct style of notation.
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Suppose your parents have 2 options to purchase a plot of land on which they plan to build a barn.
Option 1: They can purchase the land for $30,000 cash.
Option 2: They can purchase the land with $7,500 down, and then pay $2,500 semi-annually for the next 10 years,
at an interest rate of 5%.
Calculate the present value for both options, and tell which will save them the most money.
Option 1 will save your parents the most money.
Option 2 will save your parents the most money.
It is not possible to determine which option will save the most money because the question does not state how large the
barn will be.
The options both cost the same, so neither one will save them money.
Answer:
PV = $30,000; this saves the mostPV = $46,473 — the higher-cost optionStep-by-step explanation:
You want the present value and the lower-cost choice for two payment plans:
$30,000 cash$7500 down and $2500 semi-annually for 10 years at 5%Present valueThe present value of 20 semiannual payments of $2500 discounted at the rate of 5% can be found by a financial calculator to be $38,973. Together with the $7500 down payment, the present value of Option 2 is ...
Option 2 = $7500 +38,973 = $46,473
The present value of $30,000 cash is $30,000.
ComparisonOption 1 has a present value of $30,000.
Option 2 has a present value of $46,473.
Option 1 will save your parents the most money.
__
Additional comment
The total cash outlay for option 2 is $7500 + 20×2500 = $57,500. For this option to be the same cost as option 1, the account would need to earn interest at the rate of 18.4%.
There are various ways to estimate the interest earned. One of them is to compute half the value of simple interest on the interval. That is, the interest could be estimated as (1/2)(5%/yr)(10 yr) = 25%. This suggests the PV would be about 1/1.25 times the sum of payments, or 40000. That's close enough to the actual value of 39000 to tell you that Option 1 is the better choice.
PLEASE ANSWER!!!! QUICK!!!1
A pair of standard dice are rolled. Find the probability of rolling a sum of 3 these dice
P(D1 + D2 = 3) --
Be sure to reduce
Answer:
The sum of two dice can range from 2 to 12. To get a sum of 3, the only possible combinations are (1,2) and (2,1), since there is only one way to get each of those sums.
There are a total of 6 x 6 = 36 possible outcomes when two dice are rolled, since each die has 6 possible outcomes.
Therefore, the probability of rolling a sum of 3 is:
P(D1 + D2 = 3) = number of ways to get a sum of 3 / total number of possible outcomes
P(D1 + D2 = 3) = 2 / 36
Simplifying by dividing both the numerator and denominator by 2, we get:
P(D1 + D2 = 3) = 1 / 18
Therefore, the probability of rolling a sum of 3 with two standard dice is 1/18.
Step-by-step explanation:
in answer :)
Answer:
1/18
Step-by-step explanation:
got it right
30 60 90 special right triangle
The values of x and y are 16 and 16√3 respectively
What are special angles in trigonometry?The special angles on the unit circle refer to the angles that have corresponding coordinates which can be solved with the Pythagorean Theorem.
These special angles includes: 30°,45°, and 60°
sin 30 = 1/2, cos 60 = 1/2 , cos 30 = √3/2 , sin60 = √3/2 e.t.c
therefore,
sin30 = x/32
1/2 = x/32
2x = 32
x = 32/2 = 16
cos 30 = adj/hyp
√3/2 = y/32
2y = 32√3
y = 32√3/2
y = 16√3
therefore the values of x and y are 16 and 16√3 respectively.
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Help me and thank you.
The volume of the given cube is determined as (q cm)³.
What is the volume of the cube?The volume of a cube is calculated from the cube its edge length.
Mathematically, the formula for the volume of a cube is calculated by applying the following formula.
V = L x L x L = L³
where;
L is the edge length of the cubeThe volume of the given cube is calculated as follows;
V = q cm x q cm x q cm
V = (q cm)³
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Rewrite the equation below so that it does not have fractions or decimals.
5/6x+2= 3/8
The equation without decimal and fraction is 20x = -39.
Given is an equation 5x/6 +2 = 3/8
So, [tex]\frac{5x}{6} +2 = \frac{3}{8} \\\\[/tex]
Multiply the equation by 48,
[tex]\frac{5x}{6} +2 = \frac{3}{8} \\\\40x + 96 = 18\\\\40x = -78\\\\\\20x = -39[/tex]
Hence the equation without decimal and fraction is 20x = -39.
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HELP PLEASE I NEED THE ANSWER ASAP
It says that the landscaping company uses 3 1/2 tons the first month and then it says the next month uses the same amount on each of the five prodjects so for every one project in the second month they use 3 1/2 tons.
Elizabeth and Nicholas want to buy a new home in Sunset Park. They
need to borrow $270,000. Their bank offers an opportunity for the couple
to buy down the quoted interest rate of 4.8% by 0.125% per point
purchased. Each point will cost 1% of the amount borrowed. What will be
the cost to purchase 1 points?
Based on the above, the cost to purchase 1 point is $2,700.
What is the cost about?In order to know the expense of acquiring 1 point, it is imperative to ascertain the extent by which the interest rate would decrease through the purchase of 1 point.
The purchasing of each point results in a 0.125% reduction of the interest rate, so rate of interest shall be:
4.8% - 0.125%
= 4.675%
So, the cost of 1 point is 1% of the amount borrowed, that is $270,000. hence, the cost of 1 point is:
1% x $270,000
= $2,700
Therefore, the cost to purchase 1 point is $2,700.
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How many terms are in the simplest form of the product?
(x + y)(a + b)
A.2
B.3
C.4
D.5
Answer:
There are two terms in the simplest form of the product (x + y)(a + b):
The first term is the product of x and a, which is xa.
The second term is the product of y and b, which is yb.
So, the simplified product is xa + yb. Therefore, the answer is A. 2.
a coin is flipped 25 times, and we would like to know the probability that 15 or more of those flips are heads side up. is it geometric distribution a coin is flipped 25 times, and we would like to know the probability that 15 or more of those flips are heads side up. is it geometric distribution
The probability for each k value is from 15 to 25 and sum them up to get the final probability.
The situation you described is not a geometric distribution. Instead, it follows a binomial distribution. A binomial distribution is appropriate here because we have a fixed number of trials (25 coin flips), each trial has two outcomes (heads or tails), and the probability of success (getting heads) remains constant throughout the trials.
To calculate the probability of getting 15 or more heads in 25 coin flips, you can use the binomial formula:
[tex]P(X = k) = C(n, k) * p^k * (1-p)^{(n-k)}[/tex]
where n is the number of trials (25), k is the number of successful outcomes (15 or more), p is the probability of success (0.5 for a fair coin), and C(n, k) represents the number of combinations of n items taken k at a time.
You'll need to calculate the probability for each k value from 15 to 25 and sum them up to get the final probability.
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Mrs. Powell is making a piñata like the one shown below for her son's
birthday party. She wants to fill it with candy. What is the volume of the
piñata? Use the solve a simpler problem strategy.
The volume of the piñata is
1152 cubic in
How to solve for the volume of the piñataThe volume is solved by breaking the composite shape into two prisms
square prism and triangular prismThe volume is solved individually and then added together
Volume of square prism
= area x thickness
= 12 x 12 x 6
= 864 square in
Volume of triangular prism
= area x thickness
= 1/2 x 8 x 12 x 6
= 288 square in
The volume of the piñata
= 864 square in + 288 square in
= 1152 cubic in
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A country can use all its resources to produce Product A and Product B. If you know the opportunity cost of
producing Product A in terms of Product B, how can you quickly determine the cost of Product B in terms of
product A? Explain in one to two sentences, using an example.
You can take the reciprocal of the opportunity cost of producing Product A in terms of Product B to determine the cost of producing Product B in terms of Product A,
To determine the cost of producing Product B in terms of Product A, you can take the reciprocal of the opportunity cost of producing Product A in terms of Product B.
If the opportunity cost of producing 1 unit of Product A is 2 units of Product B, then the cost of producing 1 unit of Product B would be 1/2 unit of Product A.
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a question i need to do on my homework
Answer:
Step-by-step explanation:
1. Make an equation. To stay balanced the sum of everything on the left must equal the value on the right.
2 + x + 2 + x + 2 + x + 2 + x + 2 + x = 11
2. Add all like terms. We have 2+2+2+2+2 = 10 and x+x+x+x+x=5x so the equation simplifies to
10 + 5x = 11
3. Substract 10 from both sides
10 - 10 + 5x = 11 - 10
0 + 5x = 1
5x = 1
4. Divide the number being multiplied by x from both sides
5x/5 = 1/5
x = 1/5 or x = 0.2
the length of time needed to complete a certain test is normally distributed with mean 77 minutes and standard deviation 11 minutes. find the probability that it will take less than 63 minutes to complete the test. a) 0.8984 b) 0.9492 c) 0.1016 d) 0.5000 e) 0.0508 f) none of the above
The probability that it will take less than 63 minutes to complete the test is 0.1016, which corresponds to option c) in your list.
To solve this problem, we first need to standardize the value of 63 minutes using the formula:
z = (x - μ) / σ
where:
x = 63 (the given value)
μ = 77 (the mean)
σ = 11 (the standard deviation)
Plugging in these values, we get:
z = (63 - 77) / 11
z = -1.27
Next, we use a standard normal distribution table (or a calculator) to find the probability that a standard normal variable is less than -1.27. The table gives us a probability of approximately 0.1016.
However, we are not dealing with a standard normal distribution, but rather a normal distribution with a specific mean and standard deviation. To account for this, we need to use the following formula:
P(X < 63) = P(Z < -1.27) = Φ(-1.27)
where Φ is the standard normal cumulative distribution function. Using a standard normal distribution table (or a calculator), we find that Φ(-1.27) is approximately 0.1016.
Therefore, the answer is (c) 0.1016.
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Convert 0.0045 to a percent.
Select one:
0.045%
0.45%
4.5%
45%
Answer: 0.045%
Step-by-step explanation:
"A system can be defined as any set of independent parts
performin a specific function or set of functions.
True
False
Variation in a system can be maxiized by standardizing
operations.
True
False"
Question consists of two statements and you want to know if they are true or false.
1. "A system can be defined as any set of independent parts performing a specific function or set of functions."
Answer: True. A system can indeed be defined as a set of independent parts that work together to perform a specific function or set of functions.
2. "Variation in a system can be maximized by standardizing operations."
Answer: False. Variation in a system is actually minimized by standardizing operations. Standardizing operations helps to reduce variability and increase consistency in a system's performance.
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help asap please
A dog is tied to a wooden stake in a backyard. His leash is 3 meters long and he runs around in circles pulling the leash as far as it can go. How much area does the dog have to run around in? Use 3.14 for pi.
The area the dog have to run around in is 28.26 square meters
How much area does the dog have to run around in?From the question, we have the following parameters that can be used in our computation:
His leash is 3 meters long and he runs around in circles
This means that
Radius, r = 3 meters
The area is calculated as
Area = 3.14r^2
So, we have
Area = 3.14 * 3^2
Evaluate
Area = 28.26
Hence, the area is 28.26 square meters
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Assume that it is possible for two people to be the same height. Consider the following argument: Bob is the tallest person. --(P) No one is taller than Bob and no one different from Bob is the same height as Bob. --(C) (a) Using the following predicate symbols and constant: B: Bob T(a,b): a is taller than b. H(a,b): a is the same height as b. a = b: a is the same person as b Translate (P) and (C) into predicate logic formulas: (b) Although the informal argument seems to be valid, actually it is invalid. Prove that the argument is invalid by constructing a model in which the predicate formula for (P) is true and the predicate formula for (C) is false.
We have a counterexample that shows the argument is invalid.
(a) Predicate Logic Formulas:
(P) B is the tallest person: ∀x [(x ≠ B) → T(B, x)]
(C) No one is taller than Bob and no one different from Bob is the same height as Bob: ∀x [(x ≠ B) → T(B, x)] ∧ ∀y [(y ≠ B ∧ ¬(y = B ∧ H(B, y))) → T(y, B)]
In (P), we have used the universal quantifier ∀ to express that the statement applies to all people x. The symbol ≠ denotes "not equal to", and the predicate T(a, b) represents "a is taller than b". So, the formula states that for all x, if x is not Bob, then Bob is taller than x.
In (C), we have combined two quantified statements using the conjunction operator ∧. The first statement ∀x [(x ≠ B) → T(B, x)] is the same as in (P), and it means that no one is taller than Bob. The second statement ∀y [(y ≠ B ∧ ¬(y = B ∧ H(B, y))) → T(y, B)] uses a new predicate symbol H(a,b) to represent "a is the same height as b". The formula says that for all y, if y is not Bob and y is not the same height as Bob, then y is shorter than Bob.
(b) The argument is invalid. To show this, we need to construct a model in which (P) is true and (C) is false. Let's consider a universe of discourse with three people: Alice, Bob, and Charlie. We can assign the following heights to them:
Alice is shorter than Bob
Bob is the same height as Charlie
So, we have H(A, B), ¬H(A, C), and H(B, C). Note that we have not specified the relative heights of Bob and Charlie, so they could be the same or Bob could be taller.
Now, let's interpret the predicate T(a, b) as "a is at least as tall as b", so T(B, A) and T(C, B). The formula for (P) is true in this model, since there is no person taller than Bob.
However, the formula for (C) is false, because Charlie is not shorter than Bob. In fact, they are the same height according to our assignment. So, we have a counterexample that shows the argument is invalid.
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For number 1-3, identify wether or not the relation shown is a function?
1. Yes
2. No
3. Yes
Step-by-step explanation:A function is a relationship with unique x-values.
Defining a Function
For a relationship to be a function, the x-values cannot repeat. This means that inputs, aka x-values, can only have one possible output value, also called y-values. For example, if inputting x = 5 resulted in both y = 3 and y = 7, then the relationship would not be a function.
However, y-values do not have to be unique. Functions can repeat y-values and still be functions.
Answers
Now, let's apply this definition to the problems above.
1. The first question gives us a table of x and y-values. From the x-values in the left column, we can see that x-values do not repeat. This means the relationship is a function.
2. The second question gives the inputs and outputs of a function. From looking at the outputs for 0, we can tell that x = 0 produces multiple outputs. This means that not all x-values are unique. Thus, the relationship is not a function.
3. The third image is a graph. At no point on the graph do x-values repeat. Each x-value has one y-value. So, the relationship is a function. Specifically, this graph represents a quadratic function.
A soccer coach wants to choose one starter and one reserve player for a certain position. If the candidate players are 8 players, in how many ways can they be chosen and ordered?
There are 56 ways to choose and order one starter and one reserve player from a group of 8 players.
The number of ways to choose and order one starter and one reserve player from a group of 8 players can be calculated using the multiplication principle of counting.
First, we can choose one player to be the starter in 8 ways. Then, we can choose one player from the remaining 7 players to be the reserve in 7 ways.
Using the multiplication principle, we multiply the number of ways to choose the starter by the number of ways to choose the reserve to get the total number of ways to choose and order one starter and one reserve player from 8 players:
8 × 7 = 56
Therefore, there are 56 ways to choose and order one starter and one reserve player from a group of 8 players.
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Question # 7
Multiple Choice
10 students were randomly sampled and asked their shoe size. Which line plot displays the data for this sample?
9, 7, 8, 10, 9, 10, 11, 8, 8, 9
Answer:
The answer to your problem is, B.
Step-by-step explanation:
The sizes what are given.
There are:
3 - 9's
3 - 8's
1 - 7
2 -10's
1-11
Which concludes to the second graph has the right amount of x's for the given shoe sizes.
Thus the answer to you problem is, B
Question 7 (Drag&Drop 2pts): A system of equations is given. Identify the steps in the correct
order to explain how to eliminate the x in the system of equations.
STEPS
Step 1: 5x + 4y = -14
3x + 6y = 6
Step 2: -15x12y = -42
Step 3: 15x + 30y = 30
Step 4: -15x - 12y = -42
15x + 30y = 30
Equation 1: 5x + 4y = -14
Equation 2: 3x + 6y =6
EXPLANATION
The steps in order to solve the equation 5x + 4y = -14 and 3x + 6y =6 are step 1, 2, 3, and 4 respectively.
The equations 5x + 4y = -14 and 3x + 6y = 6, we have to use the steps 1, 2, 3 and 4 in the same order as stated in the question.
First, multiply Equation 1 by -3 and Equation 2 by 5, respectively, to obtain -15x - 12y = -42 and 15x + 30y = 30.
Step 2: Combine Equations 1 and 2 to take the x-variable out, resulting in 15y=-12.
Step 3: Calculate y by multiplying both sides by 15, which results in y=-4/5.
Step 4: To solve for x, enter y=-4/5 into Equation 1 or Equation 2, which will result in x = 2.
So, the correct order of the steps to eliminate x from the given equations is 1, 2, 3 and 4 respectively.
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2x^2-13x+7=x^2 to the nearest tenth
The answer for your math question is x= 12.44, x = 0.56
A flashlight battery is guaranteed to last for 40 hours. Test indicates that the length of life of these batteries is normally distributed with mean 50 and variance 16. What percentage of the batteries fail to meet the guarantee?
To find the percentage of batteries that fail to meet the guarantee, we need to calculate the probability that the battery lasts less than 40 hours. Since we know that the length of life of these batteries is normally distributed with mean 50 and variance 16, we can use the z-score formula:
z = (x - μ) / σ
where x is the value we want to find the probability for (in this case, x = 40), μ is the mean (μ = 50), and σ is the standard deviation (σ = sqrt(16) = 4).
So, we have:
z = (40 - 50) / 4 = -2.5
Looking up the probability for a z-score of -2.5 in a standard normal distribution table, we find that the probability is 0.0062, or 0.62%.
Therefore, approximately 0.62% of the batteries fail to meet the guarantee.
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