Three times the sum of two numbers is 15. One of the numbers is 9 more than one-third of the other number. How can you use a system of equations to find the two numbers

The inverse functions of f(x) = 8x - 3 is correct as  [tex]\rm g(x) = \tfrac{x + 3}{8}[/tex]. Thus, the correct option is D.

When does the inverse function come into play?

Because they allow mathematical operations to be reversed, inverse procedures are critical for solving equations.

The inverse functions of f(x) = 8x - 3 is correct as g(x) = (x + 3)/8

As,

f(x) = 8x - 3

Rewrite your term as

x = 8y − 3

Solve for y

x = 8y − 3

8y = x + 3

[tex]$ \rm y = \frac{x + 3}{8}[/tex]

Change y with g(x)

Then you have g(x) = (x + 3)/8

Thus, The inverse functions of f(x) = 8x - 3 is correct as  [tex]\rm g(x) = \tfrac{x + 3}{8}[/tex]. Thus, the correct option is D.

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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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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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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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In summary, the transmitter component of a network is responsible for generating the data to be sent, which is then modulated into a signal that is sent over the transmission medium. The receiver component of the network then demodulates the signal back into the original data. The transmission medium is important as it determines the type of signal that can be sent, and the type of data that can be transmitted.

The transmitter or sender component of a network generates the data to be sent and uses a modulator component, which converts the data into signals that can be carried by a transmission medium. This process allows data to be transmitted over long distances, such as from a computer to another computer.

The transmitter generates the data to be sent, which can be anything from text and files to audio and video. The modulator converts the data into a signal that can be sent over a transmission medium, such as fiber optic cables, coaxial cables, or satellite communication systems. This signal is then transmitted over the medium, where it is received by the receiver component, which then demodulates the signal back into the original data.

The transmission medium is important, as it determines the type of signal that can be sent. Fiber optic cables are capable of sending high-speed signals over long distances, while coaxial cables are ideal for shorter distances. Satellite communication systems are best for sending signals over large distances.

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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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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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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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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:

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

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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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!

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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Answer:

Step-by-step explanation:

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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The quadratic equation in standard form is 4x² + x + 19 = 0.

A mathematical definition of an equation is a claim that two expressions are equal when they are joined by the equals sign ("="). The two most well-known groups of equations in algebra are the linear equations and the polynomial equations. The phrase "equation in one variable" refers to an equation with just one variable. The following are a few crucial equation types: Linear equations, Quadratic equations, Cubic equation, and Quartic equations.

The standard form of the quadratic equation is:

ax² + bx + c = 0

The given equation is:

-4x² - 19 = x

Add 4x² on both sides of the equation:

-19 = 4x² + x

Add 19 on both sides of the equation:

4x² + x + 19 = 0

Hence, the quadratic equation in standard form is 4x² + x + 19 = 0.

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Answer:

16/36 = 12/27

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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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: $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.

The mean value of one trial of the given game is -$0.1667 (or -$0.17 rounded to the nearest cent).

Given, when a fair die is rolled, If a number 1 or 2 appears, you will receive $5. If any other number appears, you will pay $2.

To find the mean value of one trial of this game, we have to multiply the probability of each outcome by its associated value and sum the products together, which is expressed in the formula:

E(X) = p1 x v1 + p2 x v2 + ... + pn x vn

Where, E(X) is the expected value (or mean value) of the gamep1, p2, ..., pn are the probabilities of each outcome

v1, v2, ..., vn are the values associated with each outcome

Let the event of rolling a number 1 or 2 be called A and the event of rolling any other number be called B.p(A) = 2/6 = 1/3p(B) = 4/6 = 2/3v(A) = $5v(B) = -$2E(X) = p(A) x v(A) + p(B) x v(B) = (1/3) x 5 + (2/3) x (-2) = -0.1667

Therefore, the mean value is -$0.1667 (or -$0.17 rounded to the nearest cent).

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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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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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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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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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The height of each shoebox is 5.5 inches and  the clerk can stack 7 shoe boxes (6 full and 1 partially filled) on the shelf.

A store clerk wants to stack shoe boxes on a shelf that is 3 ft tall.

A shoebox has a volume that is 528 cubic inches and the area of the base is 96 square inches.

Find the height of each shoebox and determine how many shoe boxes the clerk can stack on the shelf.

The volume of each shoebox.

To find the height of each shoebox, we have to know its volume and base area.

Let h be the height of the shoebox.

Volume of the shoebox is V = 528 cubic inches.

And area of the base is A = 96 square inches.

Therefore, Volume of the shoebox,

V = Ah ⇒ 528 = 96h ⇒ h = 528/96 ⇒ h = 5.5 inches.

Hence, the height of each shoebox is 5.5 inches.

We need to find how many shoe boxes the clerk can stack on the shelf.

The height of the shelf is 3 ft = 36 inches.

If the height of each shoe box is 5.5 inches, then the number of shoe boxes that the clerk can stack on the shelf can be found by dividing the total height of the shelf by the height of each box.

Therefore, the number of shoeboxes the clerk can stack on the shelf is:

No. of shoeboxes = Height of the shelf / Height of each shoebox

⇒ No. of shoeboxes = 36/5.5 = 6.54.

So, the clerk can stack 6 full shoe boxes and the 7th box can be filled partially (5.5 inches of height).

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The value of x for the given inequality to justify the equation to get the desired result of the equation is x < - 4 .

Define inequality:

In mathematics, inequality refers to a statement that compares two values or expressions, indicating that one value or expression is greater than or less than the other. An inequality can be represented using symbols such as "<" (less than), ">" (greater than), "<=" (less than or equal to), ">=" (greater than or equal to), or "≠" (not equal to). For example, "2x + 3 > 5" is an inequality that states that the expression "2x + 3" is greater than "5". Inequalities are often used in algebra, calculus, and other branches of mathematics to represent relationships between variables or to solve equations.

What about equation in the relation?

In mathematics, an equation is a statement that asserts the equality of two expressions. An equation consists of two expressions, separated by an equals sign "=" and it states that the value of one expression is equal to the value of the other expression. The expressions in an equation can contain variables, constants, and mathematical operations such as addition, subtraction, multiplication, and division. Equations are used in many areas of mathematics to describe relationships between variables, to solve problems, and to make predictions. For example, the equation "x + 3 = 7" states that the value of the expression "x + 3" is equal to "7".

According to the given information:

For the following equation we have that,

⇒ - 8x < 32

⇒ -x < [tex]\frac{32}{8}[/tex]

⇒ -x < [tex]4[/tex]

⇒ x < [tex]- 4[/tex]

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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]