Cher was climbing up a rock when suddenly she slipped 4 3/5 feet.She regained control for a moment, but then slipped again, this time falling 4 3/7 feet. what fraction represents Cher's total change in elevation on the rock wall? express an overall gain as a positive or an overall loss as a negative.

Answers

Answer 1

Answer: 8 2/5 feet (positive)

Step-by-step explanation:


Related Questions

Given the circle with a center at A and a radius 7 inches.
C
mCE-
A.
B.
9
What is the approximated length of CE, in inches?
17
C. 20
=140
44
E
A
D

Answers

The approximated length of the arc CE is: 17 inches

How to find the length of the arc?

The formula for length of arc in degrees is:

s = 2πr (θ/360°)

Where:

r is radius

θ is angle subtended by arc

We are given:

r = 7

θ = 140°

Thus:

S = 2* 22/7 * 7 * (140/360°)

S = 17

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5,7,13,23,?,
What’s the answer

Answers

Answer:

29

Step-by-step explanation:

primes up to 50 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47

Answer:

5, 7, 13, 23, 37, 55

Step-by-step explanation:

The sequence is, +2, +6, +10 so it should be +14 next and then +18

4x - 2y = -2
-3 + 5y = -9
What is the solution to this system of equations?

Answers

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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Which expression represents 3 more than x

Answers

The expression represents 3 more than x is function f(x) = x + 3. Option D is the correct answer.

The phrase "3 more than x" implies that we need to add 3 to x.

Therefore, the correct expression is option d, which is x + 3.

Option a, 3x, represents three times x, which is not the same as adding 3 to x.

Option b, 3/x, represents 3 divided by x, which is also not the same as adding 3 to x.

Option c, x - 3, represents subtracting 3 from x, which is the opposite of adding 3 to x.

Therefore, the correct expression is d, x + 3.

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The question is -

Which expression represents "3 more than x"?

a. 3x

b. 3/x

c. x - 3

d. x + 3

(01. 02 MC)The number line shows the distance in meters of two divers, A and B, from a shipwreck located at point X:



a horizontal number line extends from negative 3 to positive 3. The point labeled as A is at negative 2. 5, the point 0 is labeled as X, and the point labeled B is at 1. 5


Write an expression using subtraction to find the distance between the two divers. (5 points)


Show your work and solve for the distance using additive inverses. (5 points)

Answers

The distance between two divers is 4 meters.

The distance (in meters)  of two divers from a shipwreck located at point X is shown by a number line.

Given,

A = -2.5

X = 0

B = 1.5

To find the distance between two divers, we have to find an expression using subtraction.

Distance between the two divers.

= | B - A |  or | A - B|

Substituting the values, we get

| 1.5 - (-2.5) |

 or

| -2.5 - 1.5|

or  1.5 - (-2.5)

1.5 - (-2.5)

If adding a number to the actual number gives the result 0, then that number is the additive inverse of the actual number.

Therefore, the additive inverse of -2.5 will be 2.5

1.5 + 2.5

= 4

Therefore, the distance between the two divers. = 4m

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Find the volume of the prism if the apothem is 6 cm. Round your answer to the nearest tenth, if necessary

Answers

The volume of the regular pentagonal prism is approximately 1285.5 cubic centimeters.

The formula for the volume of a regular pentagonal prism is:

V = (5/2) × apothem² × height × sin(72°)

Given that the required apothem is of 6.9 cm and the height is 8 cm, we can plug in these values into the formula:

V = (5/2) × (6.9)² × 8 × sin(72°)

V = (5/2) × 47.61 × 8 × 0.9511

V ≈ 1285.5 cubic centimeters

Therefore, we can say that the volume of the regular pentagonal prism is approximately 1285.5 cubic centimeters.

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Complete Question:

Find the volume of the following regular pentagonal prism, if the apothem is 6.9 cm and the height of the prism is 8 cm. Round your final answer to the nearest tenth if necessary.

The vertices of a rectangle are plotted.

A graph with both the x and y axes starting at negative 8, with tick marks every one unit up to 8. The points negative 7 comma 2, 4 comma 2, negative 7 comma negative 4, and 4 comma negative 4 are each labeled.

What is the perimeter of the rectangle?

11 units
66 units
17 units
34 units

Answers

The perimeter of the rectangle is 34 units.

To find the perimeter of the rectangle, we need to find the length and width of the rectangle, which are the distances between the corresponding vertices. We can use the distance formula to find the length and width.

The distance between (-7, 2) and (4, 2) is 11 units, which is the length of the rectangle.
The distance between (-7, 2) and (-7, -4) is 6 units, which is the height of the rectangle.

Therefore, the perimeter is 2 times the length plus 2 times the width, which is 2(11) + 2(6) = 22 + 12 = 34 units.

Therefore, the answer is 34 units.

Answer: D.34 units

Step-by-step explanation:

what is the minimum probability of receiving the franchise that sporthotel will accept and still believe it is wise to build the hotel? (hint: what probability will give npv)

Answers

The probability of receiving the franchise should be high enough to result in a positive NPV. The exact probability will depend on various factors such as the cost of building the hotel, expected revenues, and expenses.

To determine the minimum probability of receiving the franchise that Sporthotel will accept and still believe it is wise to build the hotel, you'll need to calculate the Net Present Value (NPV). NPV is a financial metric that considers the difference between the present value of cash inflows and the present value of cash outflows over a specific period of time.

To calculate NPV, you will need information on cash inflows, cash outflows, the discount rate, and the project's duration. You can use the following formula:

NPV = ∑ [(Cash inflow - Cash outflow) / (1 + Discount rate)^t] - Initial investment

Here, "t" represents the time period.

To find the minimum probability that results in a positive NPV, you will need to identify the cash inflows and outflows associated with receiving the franchise and building the hotel. Once you have these values, you can plug them into the NPV formula and adjust the probability until you find the value that results in a positive NPV.

In conclusion, the minimum probability of receiving the franchise that Sporthotel will accept is the probability that results in a positive NPV, which indicates that the project is expected to generate a positive return on investment.

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The area of the region between the curves y = x^2 and y = x^3 is
a. 1/12 sq units
b. 1/3 sq units
c. 1/4 sq units
d. 1/2 sq units

Answers

The area of the region between the curves y = x^2 and y = x^3 is 1/12 sq units. The correct answer is option a.

To find the area of the region between the curves y = x^2 and y = x^3, we need to integrate the difference between the two curves with respect to x from the point where they intersect.

First, we need to find where the curves intersect by setting them equal to each other:
x^2 = x^3
x^3 - x^2 = 0
x^2(x-1) = 0
x = 0 or x = 1

So the curves intersect at x = 0 and x = 1.

Now, we can set up the integral to find the area between the curves:
A = ∫[0,1] (x^3 - x^2) dx

Evaluating the integral, we get:
A = [x^4/4 - x^3/3] from 0 to 1
A = (1/4 - 1/3) - (0 - 0)
A = 1/12 sq units

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5. Given that f(x) = log (1 - x).. Find the derivative by expanding it into power expansion

Answers

The derivative of f(x) = log(1 - x) by expanding it into a power series is f'(x) = -(1 + x + x^2 + x^3 + ...).

To find the derivative of f(x) = log(1 - x) by expanding it into a power series, we first need to expand log(1 - x) using a power series and then differentiate term by term.

Here's how to do it:

1. Recall the power series expansion for the natural logarithm of (1 - x):
  ln(1 - x) = -(x + x^2/2 + x^3/3 + x^4/4 + ...)

2. Now we have the power series representation of f(x):
  f(x) = -(x + x^2/2 + x^3/3 + x^4/4 + ...)

3. Differentiate term-by-term with respect to x:
  f'(x) = -[1 + (2x)/2 + (3x^2)/3 + (4x^3)/4 + ...]

4. Simplify the expression:
  f'(x) = -[1 + x + x^2 + x^3 + ...]

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Are irrational numbers such as π included in the domain of the function f(x) = 7

Answers

Yes, irrational numbers such as π are included in the domain of the function f(x) = 7.

The domain of a function is the set of all possible input values (x) for which the function is defined. In the case of the function f(x) = 7, the output value (y) is always equal to 7, regardless of the input value.

Since every real number, including irrational numbers like π, can be an input value for f(x) = 7, the domain of this function is the set of all real numbers, which includes both rational and irrational numbers. Therefore, π is included in the domain of the function f(x) = 7.

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2.
P
R
S
T
Vertical Angles
Q

Answers

The vertical angles in the diagram are;

a. <RUP and <SUQ

b. <SUP and <RUQ

What are vertical angles?

Two angles are said to be vertical angles if they are opposite to each other and are formed by two lines intersecting at a point. One common property of vertical angles is that they have equal measures.

The intersection of the two lines produce a series of angles which have some similar or common properties.

Now considering the attachment in the question, it can be deduced that;

a. <RUP is vertical to <SUQ; as such they have equal measure.

b. <SUP is vertical to <RUQ; so they have equal measure.

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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?

Answers

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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Bilquis decides to estimate the volume of a coffee cup by modeling it as a right cylinder. She measures its height as 8.5 cm and its radius as 3 cm. Find the volume of the cup in cubic centimeters. Round your answer to the nearest tenth if necessary.​

Answers

The coffee cup has a volume of around 240.3 cubic centimeters.

The volume of a cylinder is given by the formula

V = πr²h, where r is the radius and h is the height.

Substituting the given values, we have:

V = π(3²)(8.5)

V = 240.331 cubic centimeters (rounded to the nearest tenth)

Therefore, the volume of the coffee cup is approximately 240.3 cubic centimeters.

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find the distance between and midpoint of the line segment defined by the two points (-4,2) and (-1,3)

Answers

Answer: exact form-√10 decimal form- 3.16227766...

Step-by-step explanation:

Hope this helps.

The midpoint of the line segment is (-5/2, 5/2). To find the distance between two points on a coordinate plane, we use the distance formula:

d = √((x₂ - x₁)² + (y₂ - y₁)²)

Using this formula, we can find the distance between the points (-4,2) and (-1,3):

d = √((-1 - (-4))² + (3 - 2)²)
d = √(3² + 1²)
d = √10

Therefore, the distance between the two points is √10, which is approximately 3.16 units.

To find the midpoint of the line segment defined by these two points, we use the midpoint formula:

((x₁ + x₂)/2, (y₁ + y₂)/2)

Using this formula, we can find the midpoint of the line segment:

(((-4) + (-1))/2, (2 + 3)/2)
((-5/2), (5/2))

Therefore, the midpoint of the line segment is (-5/2, 5/2).

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measuring lung function: one of the measurements used to determine the health of a person's lungs is the amount of air a person can exhale under force in one second. this is called the forced expiratory volume in one second, and is abbreviated . assume the mean for -year-old boys is liters and that the population standard deviation is . a random sample of -year-old boys who live in a community with high levels of ozone pollution is found to have a sample mean of liters. can you conclude that the mean in the high-pollution community differs from liters? use the level of significance and the critical value method with the table.

Answers

We can draw the conclusion that there is enough data to demonstrate that, at a significance level of = 0.05, the mean forced expiratory volume in one second for the population of 13-year-old boys in the high-pollution community differs from the established mean of 2.6 liters.

To test whether the mean forced expiratory volume in one second (FEV1) for the population of 13-year-old boys in the high-pollution community differs from the known mean of 2.6 liters, we can use a one-sample t-test.

Given that the sample size is not provided, we assume it to be large enough for the sample mean to follow a normal distribution by the central limit theorem.

The null hypothesis is: H0: μ = 2.6 (the population mean is equal to 2.6 liters)

The alternative hypothesis is: Ha: μ ≠ 2.6 (the population mean is not equal to 2.6 liters)

We will use a significance level of α = 0.05.

To find the critical value, we need to determine the degrees of freedom. Since the sample size is not given, we can assume it to be large enough (say, n > 30) and use a t-distribution with degrees of freedom approximately equal to n - 1.

Using a t-table with 30 degrees of freedom (which is conservative), the critical values for a two-tailed test with α = 0.05 are -2.042 and 2.042.

The test statistic can be calculated as:

t = (sample mean - hypothesized mean) / (sample standard deviation / sqrt(sample size))

t = (sample mean - 2.6) / (population standard deviation / sqrt(sample size))

Since the sample standard deviation is not given, we can use the population standard deviation as an estimate (assuming that the sample is representative of the population). Thus,

t = (3.0 - 2.6) / (0.5 / sqrt(n))

t = 0.4 / (0.5 / sqrt(n))

We do not know the sample size, but we can solve for n using the given sample mean and standard deviation:

standard error = population standard deviation / sqrt(n)

0.5 / sqrt(n) = (3.0 - 2.6) / t

n = (0.5 / ((3.0 - 2.6) / t))^2

n = (0.5 / (0.4 / 2.042))^2

n = 107

Thus, the sample size is 107. Now we can calculate the test statistic:

t = (3.0 - 2.6) / (0.5 / sqrt(107))

t = 4.89

The calculated t-value of 4.89 is greater than the critical value of 2.042, so we reject the null hypothesis.

We can conclude that there is sufficient evidence to suggest that the mean forced expiratory volume in one second for the population of 13-year-old boys in the high-pollution community differs from the known mean of 2.6 liters at a significance level of α = 0.05.

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solve all of these problems please:
WILL GIVE BRAINLIEST
PLSSSSSSSSSS

Answers

The area and Perimeter of the figures are:

1) A = 77.1 cm²

2) A = 22 cm²

3) A = 84.82 cm²

4) A = 86.14 cm²

P = 33.33 cm²

Find the area and perimeter?

1) The area of a circle is:

A = πr²

Thus, area of shaded region is:

A = (π * 6²) - (6 * 6)

A = 77.1 cm²

2) Area of shaded region is:

A = (π * 3²) - ((π * 1²) + (π * 1²))

A = 7 * π

A = 22 cm²

3) Area of the composite figure is:

A = ¹/₂(π * 9²) + 3*¹/₂(π * 3²)

A = 84.82 cm²

4) Area of composite figure is:

A = ¹/₂(π * 3²) + ¹/₂(6 * 6)

A = 86.14 cm²

Perimeter of composite figure is:

P = 6 + √72 + (2 * π * 3)

P = 33.33 cm²

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Consider two random variables X and V with the following joint probability density function:
f(x,y)=8xy;0≤y≤x≤1 a. Find joint probability distribution function of x and y.
b. Find marginal density function of random variable Y.
c. Find conditional density function of f(x|y=0.5). d. Find P(y−x≤−1/2).

Answers

P(y-x ≤ -1/2) = ∫∫f(x,y)dxdy where y-x ≤ -1/2

= ∫(y+1/2)∫y8xydxdy (since x lies between y+1/2 and 1)

= 1/64

Therefore, P(y-x ≤ -1/2) = 1/64.

a. The joint probability distribution function of X and Y can be obtained by integrating the joint probability density function over the region where 0 ≤ y ≤ x ≤ 1:

F(x,y) = ∫∫f(u,v)dudv

= ∫y∫x8uvdudv (since 0 ≤ y ≤ x ≤ 1)

= 4xy^2

b. To find the marginal density function of Y, we integrate the joint probability density function over all possible values of X:

fY(y) = ∫f(x,y)dx from 0 to y + ∫f(x,y)dx from y to 1

= ∫y^18xydx + ∫y^18yxdx

= 4y^3

c. To find the conditional density function of X given Y = 0.5, we use the formula:

f(x|y=0.5) = f(x,0.5)/fY(0.5)

f(x,0.5) is obtained by substituting y = 0.5 in the joint probability density function:

f(x,0.5) = 4x(0.5) = 2x

fY(0.5) is obtained by substituting y = 0.5 in the marginal density function of Y:

fY(0.5) = 4(0.5)^3 = 0.5

So, f(x|y=0.5) = 2x/0.5 = 4x

d. To find P(y-x ≤ -1/2), we integrate the joint probability density function over the region where y - x ≤ -1/2:

P(y-x ≤ -1/2) = ∫∫f(x,y)dxdy where y-x ≤ -1/2

= ∫(y+1/2)∫y8xydxdy (since x lies between y+1/2 and 1)

= 1/64

Therefore, P(y-x ≤ -1/2) = 1/64.

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Find the Boolean product of A= 1001
0101
1111
and
B = 10
01
11
10

Answers

Answer:Yes, the Boolean sum is represented as a Boolean product.

Step-by-step explanation:Problem 2. Let A be a 3 × 3 zero-one matrix. Let I be a 3 × 3 identity matrix. Show that A ⊙ I = I ⊙ A = A. Solution. Let. Show that a Boolean function can be represented as a Boolean product of maxterms. This representation is called the product-of-sums expansion or conjunctive normal form of the function. (Hint: Include one maxterm in this product for each combination of the variables where the function has the value 0.)

Step 1: Definition.

The complements of an elements 0=1 and 1=0.

.

The Boolean sum + or OR is 1 if either term is 1.

The Boolean product (.) or AND is 1 if both term are 1.

Step 2: Show the Boolean function can be represented as a Boolean product.

The Boolean sum is

where

or

, has the value 0 for exactly one combination of the values of the variables, namely, when

if

and

if

. This Boolean sum is called a maxterm.

For each combination of the values of the variables for which the Boolean function F is 0.

The Boolean product of maxterms is 0 if and only if at least one of the maxterm is 0. Thus, the Boolean function F can be represented as a Boolean product of the maxterm.

Therefore, the Boolean sum is represented as Boolean products.

To find the Boolean product of A and B, we need to perform a logical AND operation between each corresponding pair of bits in A and B.

Starting with the rightmost bit in B, we have:

1 AND 0 = 0

Next, we have:

1 AND 1 = 1

Then:

1 AND 1 = 1

And finally:

0 AND 1 = 0

So the result of the first column is:

0110

Moving on to the next column, we have:

1 AND 0 = 0

0 AND 1 = 0

1 AND 1 = 1

1 AND 0 = 0

So the result of the second column is:

0000

Continuing on to the third column, we have:

0 AND 0 = 0

1 AND 1 = 1

1 AND 1 = 1

1 AND 1 = 1

So the result of the third column is:

1111

Finally, we have:

1 AND 1 = 1

0 AND 0 = 0

0 AND 1 = 0

1 AND 0 = 0

So the result of the fourth column is:

0000

Putting it all together, the Boolean product of A and B is:

0110
0000
1111
0000

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The table represents some points on the graph of a linear function. x f(x) −6 −5 −2 −2 2 1 6 4 10 7 Which equation represents the same relationship? A.3x−4y=5 B.4x−3y=−2 C.4x−3y=5 D.3x−4y=2

Answers

The equation that represents the same relationship is D. 3x−4y=2

How to explain the equation

It should be noted that the equation of the line in slope-intercept form is:

y = (3/4)x - 1/2

Multiplying both sides of this equation by 4 to eliminate the fraction, we get:

4y = 3x - 2

Rearranging this equation to the standard form, we get:

3x - 4y = 2

Therefore, the answer is D. 3x - 4y = 2.

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What’s the answer?pls I need help

Answers

A. The midpoint M is given as follows: (5, -4.5).

B. The distance between the two points is given as follows: 13 units.

What is the midpoint concept?

The midpoint between two points is the halfway point between them, and is found using the mean of the coordinates.

The coordinates of the complex numbers are given as follows:

A(-1, -2) and B(11, -7).

Hence the coordinates of the midpoint are given as follows:

x = (-1 + 11)/2 = 5.y = (-2 - 7)/2 = -4.5.

Applying the formula for the distance between two points, the distance between A and B is given as follows:

d = sqrt[(11 - (-1))² + (-7 - (-2))²]

d = 13 units.

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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.

Answers

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?

what are the answers to this ​

Answers

The effects of the interest rate in each situation are given as follows:

Theo: lower interest.Sarah: lower interest.Jacob: higher interest.Management: higher interest.Joey: higher interest.

What is interest rate?

The interest rate is the percentage by which an amount of money increases over a period of time.

For lower interest rate, loans or purchases are desired, as the person can pay back the loan after some time without a high additional tax.

For higher interest rates, investments are desired, as the balance of the investment should increase fast. Purchases, on the other hand, should be avoided with higher interest, as there will be a high tax for paying the purchase in installments.

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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.

Answers

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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A crane lifts a 425 kg steel beam vertically a distance of 66 m. How much work does the crane do on the beam if the beam accelerates upward at 1. 8 m/s2? Neglect frictional forces. ?

Answers

The work done on lifting the steel beam by crane upwards is 3.3×10⁵ joules, based on given data.

Since the crane is lifting the steel beam upwards, the total force will be sum of mass and force due to acceleration due to gravity.

So, the formula will be-

W = F × d

W = m(g + a) × d

W = 425 (10 + 1.8) × 66

Performing addition in the parenthesis first

W = 425 × 11.8 × 66

Multiplying all the digits on Right Hand Side of the equation

W = 3,30,990 Joules

Hence, the work done is 3.3 × 10⁵ Joules

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Maura spends $5.50 in materials to make a scarf. She sells each scarf for 600% of the cost of materia
Complete the sentence by selecting the correct word from the drop down choices.
Maria sells each scarf for Choose... or Choose...

Answers

Maria sells each scarf for  $33 if Maura spends $5.50 in materials to make a scarf and she sells each scarf for 600% of the cost of material

Given that Maura spends $5.50 in materials to make a scarf.

Maura sells each scarf for 600% of the cost of material

Let us find 600 % of 5.50

600/100×5.50

6×5.50

$33

Maria sells each scarf for 600% of the cost of materials, which means she sells each scarf for 6 times the cost of materials.

Therefore, Maria sells each scarf for  $33.

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The vertices of ABC are A(-3,4) B(-2,4) and C(-5,2). If ABC is reflected actoss the line y=1 to produce the image A'B'C find the coordinates of the vertex C'

Answers

Answer: the point is (5,4)

Question 18 (1 point) ✓ Saved We want to know if Brenda's IQ is significantly different from the rest of her psychology class. Which test would be use? a) one sample t-test b) one sample z-test c) independent samples t-test d) dependent samples t-test ✓ Saved

Answers

The appropriate test to determine if Brenda's IQ is significantly different from the rest of her psychology class would be the one sample t-test.

To determine if Brenda's IQ is significantly different from the rest of her psychology class, you would use a one-sample t-test.

This test is appropriate because it compares the mean of a single sample (Brenda's IQ) to a known population mean (the rest of the class) when the population standard deviation is unknown. The one-sample t-test helps determine if there is a significant difference between the individual and the group.

The other options, such as the one sample z-test and the independent and dependent samples t-tests, are used for different types of comparisons and would not be appropriate in this scenario.

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What is the distance from (−4, 7) to (−4, −10)?

17 units
−17 units
3 units
−3 unitsWhat is the distance from (−4, 7) to (−4, −10)?

17 units
−17 units
3 units
−3 units

Answers

The distance from (−4, 7) to (−4, −10) is 17 unit.

We have the points (-4, 7) and (-4, -10)

Using the distance formula

d = √(-4 - (-4))² + (-10-7)²

d= √(-4+4)² + (-17)²

d= √0² + 289

d= √0 + 289

d = 17 unit

Thus, the distance is 17 unit.

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Suppose a test for a disease has a sensitivity of 93% and a specificity of 89%. Further suppose that in a certain country with a population of 60,000, 30% of the population has the disease. Fill in the accompanying table. Has Disease Does Not Have Disease Total Positive Test Result Incorrect: Your answer is incorrect. Incorrect: Your answer is incorrect. Incorrect: Your answer is incorrect. Negative Test Result Incorrect: Your answer is incorrect. 37380 Correct: Your answer is correct. Incorrect: Your answer is incorrect. Total 18000 Correct: Your answer is correct. 42000 Correct: Your answer is correct. 60000 Correct: Your answer is correct.

Answers

The table is:

                                    Has Disease    Does Not Have Disease     Total
Positive Test Result:         16,740                4,620                           21,360
Negative Test Result:        1,260                37,380                          38,640
Total:                                  18,000              42,000                          60,000



1. Total population: 60,000
2. Disease prevalence: 30% of the population has the disease, so 0.30 * 60,000 = 18,000 people have the disease, and 60,000 - 18,000 = 42,000 people do not have the disease.
3. Sensitivity (True Positive Rate): 93% means that out of those with the disease, 93% will test positive. So, 0.93 * 18,000 = 16,740 positive tests among those with the disease.
4. Specificity (True Negative Rate): 89% means that out of those without the disease, 89% will test negative. So, 0.89 * 42,000 = 37,380 negative tests among those without the disease.
5. False Negative Rate: Since the test has a sensitivity of 93%, the false negative rate is 100% - 93% = 7%. Thus, 0.07 * 18,000 = 1,260 false negatives.
6. False Positive Rate: Since the test has a specificity of 89%, the false positive rate is 100% - 89% = 11%. Thus, 0.11 * 42,000 = 4,620 false positives.

Now we can fill in the table:

                                    Has Disease    Does Not Have Disease     Total
Positive Test Result:         16,740                4,620                           21,360
Negative Test Result:        1,260                37,380                          38,640
Total:                                  18,000              42,000                          60,000

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