A circle of radius 2 is inscribed in a semicircle, as shown. The area inside the semicircle but outside the circle is shaded. What fraction of the semicircle's area is shaded?
(A) 1/2
(B) π/6
(C) 2/π
(D) 2/3
(E) 3/π

a) There were 24,000 liters of water in the tank when draining began.

b) There were 9,000 liters of water in the tank 10 minutes after draining began.

c) the average rate of change of the volume of water during the first 10 minutes was -1,500 liters/minute.

d) The rate of change of the volume of water 10 minutes after draining began was -900 liters/minute.

e) The rate of water draining from the tank is slowing down as time goes on.

a) The volume of water in the tank when draining began can be found by setting t = 0 in the equation [tex]V(t) = 15(40-t)^2[/tex]:

[tex]V(0) = 15(40-0)^2 = 24,000[/tex] liters.

Therefore, there were 24,000 liters of water in the tank when draining began.

b) The volume of water in the tank 10 minutes after draining began can be found by setting t = 10 in the equation [tex]V(t) = 15(40-t)^2[/tex]:

[tex]V(10) = 15(40-10)^2 = 9,000[/tex] liters.

Therefore, there were 9,000 liters of water in the tank 10 minutes after draining began.

c) The average rate of change of the volume of water during the first 10 minutes can be found using the formula:

average rate of change = [tex]\frac{(V_{10} - V_0)}{10}[/tex]

Where [tex]V_{10}[/tex] and [tex]V_0[/tex] are the volumes of water in the tank 10 minutes and 0 minutes after draining began, respectively.

Substituting the values we found in parts (a) and (b), we get:

average rate of change [tex]= \frac{(9,000 - 24,000)}{10} = -1,500[/tex] liters/minute.

Therefore, the average rate of change of the volume of water during the first 10 minutes was -1,500 liters/minute.

d) The rate of change of the volume of water 10 minutes after draining began can be found by taking the derivative of V(t) with respect to t and evaluating it at t = 10:

[tex]V'(t) = -30(40-t)[/tex]

[tex]V'(10) = -30(40-10) = -900[/tex] liters/minute.

Therefore, the rate of change of the volume of water 10 minutes after draining began was -900 liters/minute.

e) To determine whether the rate at which the volume is changing is increasing or decreasing during the draining, we need to look at the sign of the second derivative of V(t) with respect to t. The second derivative is:

[tex]V''(t) = -30[/tex]

Since V''(t) is negative for all values of t, we conclude that the rate at which the volume is changing is decreasing during the draining. In other words, the rate of water draining from the tank is slowing down as time goes on.

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If det(n100) is equal to zero, then n100 is not invertible.

However, if det(n100) is non-zero, then n100 is invertible.

Given that the determinant of a matrix is a value associated with a square matrix, we can use det() to calculate the determinant of n100, as shown below: det(n100)

Based on this information, we cannot conclude whether or not n100 is invertible.

However, we can use the following statement to determine whether or not a matrix is invertible:

A matrix is invertible if and only if its determinant is non-zero.

If det(n100) is equal to zero, then n100 is not invertible.

However, if det(n100) is non-zero, then n100 is invertible.

Therefore, the determinant is an important tool that can help us determine whether or not a matrix is invertible.

Therefore, we must calculate det(n100) to determine if n100 is invertible or not.

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Answer:

[tex]\frac{32}{15}[/tex]

Step-by-step explanation:

afternoon=[tex]\frac{21}{3}[/tex] +[tex]\frac{11}{5}[/tex]

L.C.M=15

[tex]\frac{21+11}{15}[/tex]

[tex]\frac{32}{15}[/tex]

The average gradient of the stream is 0.3 meters/kilometer (m/km).

To calculate this, we need to determine the change in elevation over the distance of 200 kilometers. Therefore, the difference in elevation is 600 meters (the starting elevation) minus the elevation at the ocean (assumed to be 0 meters). Dividing this difference (600 meters) by the distance (200 kilometers) gives us the average gradient: 0.3 m/km.

It is important to remember that this is only an average, and the gradient of a stream is not constant throughout its course. Factors such as terrain, obstacles, and rainfall will all affect the gradient of the stream, making it higher or lower at certain points. It is also important to note that a negative gradient means the elevation of the stream is decreasing, while a positive gradient indicates that the elevation is increasing.

In conclusion, the average gradient of the stream beginning at 600 meters and flowing 200 kilometers to the ocean is 0.3 m/km.

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The formula to find the sum of the measures of the interior angles of a regular polygon is: S = (n - 2) * 180 where S is the sum of the interior angles, and n is the number of sides of the polygon.

This formula can be derived using the fact that the sum of the interior angles of any polygon is equal to (n - 2) * 180 degrees, where n is the number of sides.

For a regular polygon, all interior angles are equal, so we can divide the sum of the interior angles by the number of sides to find the measure of each angle. Let's call this measure x. Then we have:

S = nx

Solving for x, we get:

x = S/n

Substituting S = (n - 2) * 180, we get:

x = ((n - 2) * 180)/n

This formula gives us the measure of each interior angle of a regular polygon in terms of its number of sides. To find the sum of the measures of the interior angles, we can simply multiply the measure of each angle by the number of sides and then sum them up. Alternatively, we can use the formula S = (n - 2) * 180 directly to find the sum of the interior angles without finding the measure of each angle first.

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There are 13,225 different ways to select a committee of size 3 from a group of 15 people, where one person will be president, one will be vice president, and one will be treasurer.

To calculate this, we can use a combination formula. The formula for combinations is nCr = n! / (r! * (n - r)!), where n is the size of the group and r is the number of people in the committee.

In this case, n = 15 and r = 3.

Using this formula, we can calculate that there are 15! / (3! * (15 - 3)!) = 13,225 different ways to select a committee of size 3 from a group of 15 people, where one person will be president, one will be vice president, and one will be treasurer.

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Therefore , the solution of the given problem of equation comes out to be  x = 5 is a correct answer to the problem.

Complex algorithms frequently employ variable words to demonstrate coherence between two opposing assertions. Equations are academic expressions that are used to demonstrate the equality of different academic figures. In this instance, normalization results in a + 7 rather than a separate algorithm who divides 12 onto two separate components and is able to evaluate data obtained from x + 7.

Here,

We can begin by making the provided equation simpler:

=> 5/(x - 4) = x/(x - 4)

=> 5 = x

Consequently, x = 5 is the answer to the problem.

The result of adding x = 4 to the initial equation is:

=> 5/(4 - 4) = 4/(4 - 4)

That amounts to:

=> 5/0 = 4/0

However, since division by zero is undefinable, the answer x = 4 is superfluous and does not satisfy the equation.

The result of the initial equation with x = 5 is:

=> 5/(5 - 4) = 5/(5 - 4)

That amounts to:

=> 5/1 = 5/1

As a result, x = 5 is a correct answer to the problem.

In conclusion, only one of the solutions -x = 5 is correct, and the other

-x = 4 is unnecessary because it results in a divide by zero.

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The surface area of the sphere with a radius of 2.7 centimeters is approximately 91.68 square centimeters.

To calculate the surface area of a sphere, we use the formula:

A = 4πr²

where A is the surface area and r is the radius.

Plugging in the value of the radius (2.7 cm), we get:

A = 4π(2.7 cm)² = 4π(7.29 cm²) ≈ 91.68 cm²

Rounding to the nearest square centimeter, we get the final answer of approximately 91.68 square centimeters.

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The total area of the composite figure is 114.25 square feet.

The area of a circle of diameter D is:

A = 3.14*(D/2)²

And the area of a triangle of base B and height H is:

A = B*H/2

We can decompose the figure into two simpler ones, a triangle of base of 10ft and height of 15 ft, whose area is:

A = 10ft*15ft/2 = 75ft²

And half of a circle of diameter of 10ft, whose area is:

A = 0.5*3.14*(10ft/2)² = 39.25 ft²

Then the total area of the figure is:

area =  75ft² + 39.25 ft² = 114.25 ft²

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Answer: $15

Step-by-step explanation:

If he spends $80 on two games because if he was to buy three games he would be over his $100. Plus tax is $85.

Answer:

the juniors, this is because they are the juniors, which means they are the smaller ones here and the ones who need a speech of inspiration and motivation

Ronaldo's family drove a total of 6.90 kilometres to get from their house to the store.

To determine the total distance Ronaldo's family drove, we need to add the distance from their house to the gas station and the distance from the gas station to the store. We can write this as:

[tex]4 6/10 km + 2 30/100 km[/tex]

To add these two distances, we need to find a common denominator for the fractions. The smallest common denominator for 10 and 100 is 100, so we can convert the first distance to an equivalent fraction with a denominator of 100:

[tex]4 6/10 km = 4 60/100 km = 4.60 km[/tex]

Then we can add the two distances:

[tex]4.60 km + 2.30 km = 6.90 km[/tex]

Therefore, Ronaldo's family drove a total of 6.90 kilometres to get from their house to the store.

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From the figure answer is option B which is The height of the surface increases, then decreases, from the center out to the sides of the road.

Quadratic regression is a statistical method used to model the relationship between a dependent variable and an independent variable using a quadratic function. It is a type of polynomial regression, where the regression equation is a polynomial of degree two.

A center can refer to a point or a location that is the middle or central part of something. For example: In team sports, the center is a position that is located in the middle of the playing area or the team formation, and is often responsible for initiating or directing the team's plays.

In the given question ,

Let  y  be  height of the surface   and    x be length of the road    we know that the quadratic regression graphed represent a vertical parabola open downward

The function increase in the interval   [-5,0 ] to [0,0.30]    

The function decrease in the interval    [0,0.30]  to  [5,0]  

Therefore

The height of the surface increases, then decreases, from the center out to the sides of the road. If the height of the road surface is modeled by a quadratic function, it could have this U-shape, with the highest point (the vertex of the parabola) representing the center of the road, and the height decreasing as you move away from the center to the sides of the road.

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Answer:

Step-by-step explanation:

If 300 people were sampled instead of 200, and the confidence level remained the same, it would produce a more accurate result.

Sampling means selecting the group that you will actually collect data from in your research. For example, if you are researching the opinions of students in your university, you could survey a sample of 100 students. In statistics, sampling allows you to test a hypothesis about the characteristics of a population.

This is because a larger sample size allows for a better representation of the population, providing a more accurate result. Additionally, with a larger sample size, the confidence interval of the sample would be narrower, indicating a higher level of confidence in the accuracy of the result.

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An equation of this line in slope intercept form is y = -1/6(x) - 5.

In Mathematics and Geometry, the slope-intercept form of the equation of a straight line is represented by this mathematical expression;

y = mx + c

Where:

First of all, we would determine the slope of this line;

Slope (m) = (y₂ - y₁)/(x₂ - x₁)

Slope (m) = (-5 - 0)/(0 - (-30)

Slope (m) = -5/30

Slope (m) = -1/6

At data point (0, -5), a linear equation in slope-intercept form for this line can be calculated as follows:

y = mx + c

y = -1/6(x) + (-5)

y = -1/6(x) - 5

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To show that there are arbitrarily long strings of consecutive integers each divisible by a perfect square greater than 1,

Solution:

follow these steps:

1. Choose an arbitrary positive integer, n.

2. Define a string of consecutive integers, starting with the product of the first n+1 positive perfect squares:

S = (2^2 * 3^2 * ... * (n+1)^2).

3. The next n consecutive integers will be S+1, S+2, ..., S+n.

4. Each of these consecutive integers, S+i (where 1 <= i <= n), is divisible by a perfect square greater than 1.

Here's why:

- S is divisible by all perfect squares from 2^2 to (n+1)^2, which are greater than 1.

- S+1 is divisible by 2^2, as S = (2^2 * 3^2 * ... * (n+1)^2) is an even number and (S+1) - 1 = 2^2 * K (where K is some integer).

- S+2 is divisible by 3^2, as S = (2^2 * 3^2 * ... * (n+1)^2) is divisible by 3^2 and (S+2) - 2 = 3^2 * K (where K is some integer).

- Continuing this pattern, S+i is divisible by (i+1)^2, for all 1 <= i <= n.

Thus, we have demonstrated that there are arbitrarily long strings of consecutive integers each divisible by a perfect square greater than 1.

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Answer:

4 and 3

Step-by-step explanation:

1/7(1+2+3+4+.....+7)

1/7(28)

4

1/5(1+2+3+4+....+5)

1/5(15)

3

The expected value of the sum of two dice with 7 and 5 sides respectively is 11.


To calculate the expected value of the sum of two dice, we can use the formula for expected value, which is equal to the sum of all possible outcomes multiplied by their corresponding probabilities.

In this case, the possible outcomes are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12, with their corresponding probabilities being 1/35, 2/35, 3/35, 4/35, 5/35, 6/35, 5/35, 4/35, 3/35, 2/35, and 1/35 respectively.

So, the expected value of the sum of the two dice is 2*(1/35) + 3*(2/35) + 4*(3/35) + 5*(4/35) + 6*(5/35) + 7*(6/35) + 8*(5/35) + 9*(4/35) + 10*(3/35) + 11*(2/35) + 12*(1/35) = 11.

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Answer:

5x+2y = -24

Step-by-step explanation:

We have the point (-4,-2) and a slope of -5/2.

Using the point-slope form of a line:

y-y1 = m(x-x1)  where m is the slope and (x1,y1) is a point on the line.

y- -2 = -5/2(x- -4)

y+2 = -5/2 (x+4)

Multiply each side by 2.

2(y+2) = -5(x+4)

2y+4 = -5x-20

Add 5x to each side.

5x+2y +4 = -20

Subtract 4 from each side.

5x+2y = -24

We can find the equation of the line passing through the given two points (-4, 7) and (2, -2) using the slope-intercept form of a linear equation:

slope (m) = (change in y) / (change in x) = [tex](-2 - 7) / (2 - (-4)) = -9/6 = -3/2[/tex]

Using point-slope form with the first given point (-4, 7), we get:

[tex]y - 7 = (-3/2)(x - (-4))\\y - 7 = (-3/2)x - 6\\y = (-3/2)x + 1[/tex]

Now we can plug in the x-coordinates of the other points given and check if they satisfy the equation.

[tex](−2, −6):\\y = (-3/2)x + 1\\-6 = (-3/2)(-2) + 1\\-6 = 3 + 1\\-6 ≠ 4 (not on the line)[/tex]

[tex](−2, −5):\\y = (-3/2)x + 1\\-5 = (-3/2)(-2) + 1\\-5 = 3 + 1\\-5 ≠ 4 (not on the line)(4, −6):\\y = (-3/2)x + 1\\-6 = (-3/2)(4) + 1\\-6 = -6 + 1\\-6 ≠ -5 (not on the line)(4, −5):\\y = (-3/2)x + 1\\-5 = (-3/2)(4) + 1\\-5 = -6 + 1\\-5 = -5 (on the line)[/tex]

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The mean of the unintentional drug overdose deaths per 100,000 population from 1986-1996 is 2.18. (option 2).

To find the mean of a set of numbers, we add up all the numbers in the set and then divide by the total number of items in the set. In this case, we have the following numbers: 2, 1, 2, 2, 1, 2, 2, 3, 3, 3, and we want to find the mean.

To do so, we first add up all the numbers:

2 + 1 + 2 + 2 + 1 + 2 + 2 + 3 + 3 + 3 = 21

Then we divide by the total number of items in the set, which is 10:

21 / 10 = 2.1

Therefore, the mean of the unintentional drug overdose deaths per 100,000 population from 1986-1996 is 2.18.

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With a p-value of less than 0.025, we have sufficient evidence to reject the null hypothesis and conclude that the average breaking distance is different from 120 feet, at the 0.01 significance level.

The p-value is a statistical measure that helps us determine the probability of obtaining a result as extreme as the one we observed, assuming that the null hypothesis is true.

In this case, the null hypothesis is that the average breaking distance is 120 feet. The alternative hypothesis is that the average breaking distance is different from 120 feet.

If the p-value is less than the level of significance (0.01 in this case), we can reject the null hypothesis in favor of the alternative hypothesis.

A p-value of less than 0.025 indicates that the probability of obtaining a result as extreme as the one we observed (or more extreme), assuming that the null hypothesis is true, is less than 0.025.

This is a relatively small probability, which provides strong evidence against the null hypothesis. Therefore, we can conclude that the average breaking distance is different from 120 feet.

It is important to note that rejecting the null hypothesis does not necessarily mean that the alternative hypothesis is true.

It simply means that the evidence suggests that the null hypothesis is unlikely to be true. Further research and analysis may be needed to confirm the alternative hypothesis.

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Answer:

95/63 or 1 32/63

Step-by-step explanation:

turn the fraction into a mixed number/improper fraction

65/9-40/7

find a common denominator which in this case is 63

so, the first fraction you will multiply the numerator and denominator by 7 to get

455/63

then the second fraction multiply the numerator and the denominator by 9

360/63

then you would subtract the two numerators KEEP THE DENOMINATOR THE SAME

455/63-360/63=95/63

The solutions of the inequality are x > -1 and x<3. We can use the solutions of the inequality to plot the graph.

The two sides of a mathematical equation having an inequality must be equal.

We compare two values in inequality rather than using equations.

Instead of the equal sign, you can use the less-than (or less-than-or-equal-to), greater-than (or greater-than-or-equal-to), or not-equal-to signs.

Here the given inequality is -1<x<3.

Now solving this for the solutions, we get:

x > -1 and x<3.

We can use the solutions of the inequality to plot the graph.

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At an airport restaurant, the cost of one hamburger is $2.50.

Two sodas and four hamburgers cost $12.00, and an order of four sodas and two hamburgers costs $9.00.

To know the cost of each soda and hamburger, we need to use the equation (x and y)

Use x for soda, and use y for hamburger

Two sodas and four hamburgers cost $12.00

Then, (2 x x) + (4 x y) = 12

2x + 4y = 12

We need to divide the numbers by 2, as follows:

x + 2y = 6

four sodas and two hamburgers cost $9.00

(4 x x) + (2 x y) = 9

4x + 2y = 9

We have to substitute the "x", as follows:

4 (6-2y) + 2y = 9

24 - 8y + 2y = 9

24 - 6y = 9

24 - 9 = 6y

15 = 6y

y = 2.5

Therefore, the cost of one hamburger is $2.50.

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In the function f(x) = 3x + 2, f(5) = 17

A function is a mathematical equation which shows the relationship between two variables.

Since we have the function f(x) = 3x + 2 and we want to find f(5), we proceed as follows.

To find f(5) in f(x) = 3x + 2, we note that f(5)  is the value of f(x) when x = 5. So, we substitute x = 5 into the equation.

So, f(x) = 3x + 2

Substituting x = 5 into the equation, we have

f(5) = 3(5) + 2

= 15 + 2

= 17

So, f(5) = 17

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Answer:27.5

Step-by-step explanation:

i did this with a calculator, but the answer is

27.5

Answer:

Step-by-step explanation: 14 = x

Answer:

The answer to your question would be 14

Step-by-step explanation:

Simple equation

14 - 10 = 4

I hope this helps and have a wonderful day!