if y varies directly as x, and y=7 when x=3, find when x=7

The radius of the sphere with a volume of 4,500π cubic inches is 15 inches, not 2,000 inches as the student had incorrectly calculated.

What is volume?

Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space occupied within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

The volume of the sphere is given as 4,500π cubic inches.

The formula for volume of the sphere is -

V= 4/3πr³

Substituting the values in the equation -

4,500π = 4/3πr³

4,500 = 4/3r³

The mistake in the student's calculation is in the step where they simplified 4/3πr³ to 4,500.

To correct this, we need to isolate r³ by dividing both sides by 4/3 -

4,500 = (4/3)r³

4,500 ÷ (4/3) = r³

4,500 × 3/4 = r³

3,375 = r³

Then, we can take the cube root of both sides to find r -

r = ∛3,375 = 15

Therefore, the radius of the sphere is 15 inches.

To learn more about volume from the given link

https://brainly.com/question/1972490

#SPJ1

The relationship between t, the number of tickets, and c, the total cost of tickets is: c = 55t

Relation between two variables, i.e, total cost and number of tickets:

The statistical relationship between two variables is called their correlation. The correlation can be positive, which means that the two variables move in the same direction, or negative, which means that when the value of one variable increases, the value of the other variable decreases.

Based n the Question:

Since there is no processing fee and the ticket price remains the same, we know that the fee will be proportional to the number of tickets purchased. The general form of the equation expressing the proportional relationship between the cost (c) and the number of tickets (t) is:

c = kt

where k is the constant of proportionality (the cost per ticket).

We can find k by using any of the data points given in the table. Using the first point, we have :

110 = k·2

Dividing the equation by 2:

110/2 = k = 55

Then using this value for k, the desired equation can be written:

c = 55t

Complete Question:

Total cost (in dollars) Number of concert tickets. the total costs in dollars are 110 275 440. the number in concert tickets are 2, 5, 8 Write an equation to describe the relationship between the total cost in dollars (c), and the number of tickets purchased (t),

Learn more about Number:

https://brainly.com/question/17429689

#SPJ4

Factorization of the given polynomial is: (x - 15)(x - 15).

The length of a side is: x = 15

In the case of polynomials in mathematics, the factors of the polynomials are the polynomials which are multiplied to produce the original polynomial. For example, the factors of x² + 5x + 6 is (x + 2) (x + 3).

When we multiply both x + 2 and x  +3, then we will see that the original polynomial is generated.

We are given the polynomial as:

A = x² - 30x + 225

This can be broken down into:

A = x² - 15x - 15x + 225

A = x(x - 15) - 15(x - 15)

A = (x - 15)(x - 15)

Thus:

x = 15

Read more about polynomial at: https://brainly.com/question/29323186

#SPJ1

As per the given triangle, the scale factor is 24/5

To identify the scale factor, we can choose two corresponding sides of the triangles and set up a proportion. Let's choose the legs of the triangles. We know that the length of the left leg is 5, and the length of the right leg is 25/4. Therefore, we can write:

5/x = 25/4/12

Here, x represents the length of the corresponding leg of the right triangle. We can simplify this proportion by cross-multiplying:

5 x 12 = (25/4) x (x)

Multiplying both sides by 4/25, we get:

(4/25) x 5 x 12 = x

Simplifying, we get:

x = 24/5

Therefore, the scale factor is 24/5. This means that if we multiply the lengths of any side of the left triangle by 24/5, we will get the corresponding length of the right triangle.

To know more about triangle here

https://brainly.com/question/8587906

#SPJ4

Complete Question:

The right triangle on the right is a scaled copy of the right triangle on the left. Identify the scale factor. Express your answer as a fraction in simplest form.

5 and 12, 25/4 and 15

Answer:

Step-by-step explanation:

Its the 3rd one

The probability of obtaining a sample result of a mean of $470 or more if the true population mean is 460 is very low, almost zero.

To calculate the probability of obtaining a sample result of a mean of $470 or more, we need to use the sampling distribution of the mean.

Assuming that the sample size is large enough and that the sample means are normally distributed, we can use the central limit theorem to approximate the sampling distribution of the mean to a normal distribution. We can standardize the sample mean using the formula

z = (x - μ) / σ,

where x is the sample mean, μ is the population mean, and σ is the standard error of the mean.

In our case, we want to find the probability of obtaining a sample mean of $470 or more. We can convert this to a z-score by standardizing it using the formula

z = (470 - 460) / (σ / √n),

where n is the sample size.

If the sample size is 100 and the population standard deviation is 10, then the standard error of the mean is 1. We can then calculate the z-score as

=> z = (470 - 460) / (1 / √100) = 10.

We can look up the probability of obtaining a z-score of 10 or greater in a standard normal distribution table, which is almost zero.

To know more about probability here

https://brainly.com/question/11234923

#SPJ4

The area of the parallelogram above is 490 metres squared.

A parallelogram is a quadrilateral with opposite sides equal to each other and opposite sides parallel to each other.

The area of a parallelogram can be calculated as follows:

area of a parallelogram = bh

where

Therefore,

b = 49 metres

h = 10 metres

Therefore,

area of a parallelogram = 10 × 49

area of a parallelogram = 490 metres squared

learn more on area here: https://brainly.com/question/19187448

#SPJ1

Answer:

Step-by-step

To make 100 to 250, you need to multiply 100 by 2.5 to make 250. In the similar way you need to multiply 80 by 2.5 which equals 200 which is the answer

Answer:

A= 2w^2 + 11w +12

Step-by-step explanation:

(w + 4)(2w + 3) = l x b = A

2w^2 + 3w +8w +12 = A

A= 2w^2 + 11w +12

The present value that must be invested to get $2500 after 6 years at a simple interest rate of 11.0% is $1509.64.

In this case, we know the final amount that we want to have after 6 years, which is $2500. We also know the interest rate, which is 11.0%. What we need to find is the principal amount, which is the present value that we must invest now to achieve the desired future value.

Using the formula for simple interest, we can rearrange it to solve for the principal:

Principal = Simple Interest / (Rate x Time)

We know that the simple interest is the difference between the final amount and the principal amount. Therefore, we can substitute the values into the formula:

$2500 - Principal = (Principal x 0.11 x 6)

Simplifying the equation, we get:

$2500 = Principal + (0.66 x Principal)

$2500 = 1.66 x Principal

Dividing both sides by 1.66, we get:

Principal = $1509.64

To know more about simple interest here

https://brainly.com/question/22621039

#SPJ4

The numbers to correctly complete the table based on the function is 2, 3, 4, 5.

The function x-3 as any other function shows a pattern. In this case, it shows the way the value in column f(x) changes depending on the value of x. Here are some examples:

If the value of x is 34 =  34 - 3 = 31

If the value of x is 12 = 12 - 3 = 9

Based on this principle, the correct values to complete the table presented are 2, 3, 4, 5.

Note: This question is incomplete; below I attach the missing section.

Learn more about functions in https://brainly.com/question/12431044

#SPJ1

The statement "Cleanups may be carried out by the Environmental Protection Agency or private parties" is true of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), also known as Superfund.

What is the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)?

The Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), commonly known as Superfund, is a United States federal law aimed at cleaning up sites contaminated with hazardous substances as well as preventing future hazardous waste site contamination.

CERCLA was passed by the United States Congress in December 1980 as a means of counteracting the increasing risk of hazardous waste sites in the United States.

What does CERCLA cover?

CERCLA was enacted to offer a federal "Superfund" to clean up uncontrolled or abandoned hazardous waste sites, as well as responding to oil spills, chemical disasters, and other emergencies that present a threat to the public health and the environment.

Cleanups may be carried out by the Environmental Protection Agency or private parties.

When it comes to financing these cleanups, the law mandates that those responsible for the contamination pay for the cleanup or those who do not take responsibility for the pollution.

The legislation was enacted to provide for the cleanup of the country's most hazardous waste sites and to ensure that businesses that generate hazardous waste are held responsible for their toxic contributions to the environment.

To know more about Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA):

https://brainly.com/question/13873306

#SPJ11

this is incorrect because the length of the long sides cannot be expressed in terms of just y. We need additional information about the dimensions of the rectangle to determine the length of the long sides.

a) The equation that represents this situation is:

2x + 2y = 175

where x is the length of the short sides (in feet) and y is the length of the long sides (in feet).

b) The equation in terms of y is:

2(6) + 2y = 175

which simplifies to:

12 + 2y = 175

2y = 163

y = 81.5

However, this is incorrect because the length of the long sides cannot be expressed in terms of just y. We need additional information about the dimensions of the rectangle to determine the length of the long sides.

Learn more about length here

https://brainly.com/question/13194650

#SPJ4

Answer:

m = -1, c = 5

Step-by-step explanation:

Provided in the attachment.

The length of QR, considering the intersecting chords in the circle, is given as follows:

QR = 26.4.

A chord of a circle is a straight line segment that connects two points on the circle. Specifically, it is a line segment whose endpoints are on the circle. A chord is often denoted by drawing a line segment between the two endpoints, with the segment passing through the interior of the circle.

When two chords intersect each other, then the products of the measures of the segments of the chords are equal.

The product to obtain the length QR is given as follows:

37QR = 25 x 39

Then the length QR is given as follows:

QR = 25 x 39/37

QR = 26.4.

More can be learned about the chords of a circle at brainly.com/question/16636441

#SPJ1

As per the concept of confidence interval, we can be 90% confident that the true proportion of red candies in all the bags is between 0.195 and 0.285.

To do this, we first need to determine the level of confidence we want for our interval.

Next, we use a formula to calculate the confidence interval. The formula for a confidence interval for a population proportion is:

p ± z x √(p(1-p)/n)

where p is the sample proportion (in this case, 120/500 = 0.24), z* is the z-score that corresponds to the desired level of confidence (for a 90% confidence interval, z* = 1.645), and n is the sample size (in this case, 500).

Substituting the values into the formula, we get:

0.24 ± 1.645 x √(0.24(1-0.24)/500)

Simplifying, we get:

0.24 ± 0.045

Therefore, the lower limit of the confidence interval is 0.195 (0.24 - 0.045), and the upper limit is 0.285 (0.24 + 0.045).

To know more about confidence interval here

https://brainly.com/question/24131141

#SPJ4

The total cost of the items if they were not sold as a combo is R137.

Let's assume that the individual prices of the two items are X and Y. Here we have to use the concept of algebraic equation. We have two unknowns (X and Y), and we use the information given about their combined cost and the savings made when sold as a combo to form an equation in terms of X and Y

When the items are sold individually, the total cost would be X + Y.

When the items are sold together as a combo, the cost is R100, and this saves R37 compared to the individual prices. This means:

X + Y - 37 = 100

Simplifying the above equation, we get:

X + Y = 137

Learn more about algebraic equation here

brainly.com/question/953809

#SPJ4

The expression (5/7)^-1  can be written without an exponent as 8/5.

Exponents have a number of important properties, such as the product rule (a^m × a^n = a^(m+n)) and the power rule ((a^m)^n = a^(m*n)). They are used in a wide range of mathematical contexts, including algebra, calculus, and geometry.

Given that (5/8)^-1, then we can deduced that the  negative exponent is the samething as putting it in the denominator, which can be exprtessed as;

=[1/ (5/8)]

=[1 ÷ (5/8)]

[1 * 8/5]

=8/5

Learn more about exponent at:

https://brainly.com/question/12063397

#SPJ1

The altitude of the plane at the George Washington Bridge is approximately 0.2095 miles (or 1,106 feet) above sea level, plus whatever the height of the bridge is.

Altitude refers to the height of an object or location above a specific reference point, usually the Earth's sea level. In aviation, altitude is often used to describe the height of an aircraft above sea level, and is measured in feet or meters.

Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles. It involves the study of trigonometric functions, which are functions of an angle, and are used to relate the angles and sides of a right triangle.

In the given question,

To solve this problem, we need to use trigonometry and the fact that the plane descended at a 2° angle. Let's assume that the altitude of the plane at the George Washington Bridge is h feet.

Using trigonometry, we know that the tangent of the angle of descent is equal to the difference in altitude divided by the horizontal distance traveled. In this case, we have:

tan(2°) = (h - e) / 6

To solve for h, we need to isolate it on one side of the equation. Multiplying both sides by 6, we get:

6 tan(2°) = h - e

Adding e to both sides, we get:

h = 6 tan(2°) + e

We can use a calculator to find the tangent of 2°, which is approximately 0.03492. Substituting this value and the given distance of 6 miles into the equation, we get:

h = 6(0.03492) + e

h = 0.2095 + e

Therefore, the altitude of the plane at the George Washington Bridge is approximately 0.2095 miles (or 1,106 feet) above sea level, plus whatever the height of the bridge is.

To know more about trigonometry, visit:

https://brainly.com/question/29002217

#SPJ1

The expression that could result in a final unit measure of dollars is given by (mnk²) dollars.

To write an expression that could result in a final unit measure of dollars, we need to consider the units given.

We have three units, i.e., m feet, n feet, and k dollars per square foot.

To convert these units to dollars, we need to multiply the given units with appropriate conversion factors.

The conversion factor for the given units is as follows:

Unit 1: 1 foot = k dollars (Conversion factor)

Unit 2: 1 foot = k dollars (Conversion factor)

Unit 3: 1 square foot = 1 x k dollars = k dollars (Conversion factor)

Now, let us write the expression that results in a final unit measure of dollars.

The expression should be written in HTML format.

Let us begin: Final Unit Measure = (Unit 1) x (Unit 2) x (Unit 3)

Final Unit Measure = (m feet) x (n feet) x (k dollars per square foot)

Final Unit Measure = m x k dollars x n x k dollars per square foot

Final Unit Measure = (m x k x n x k) dollars

Final Unit Measure = (mnk²) dollars.

Thus, the expression that could result in a final unit measure of dollars is given by (mnk²) dollars.

For similar question on final unit measure.

https://brainly.com/question/18828615

#SPJ11

Answer:

The volume of a rectangular prism is given by the formula V = l x w x h, where l is the length, w is the width, and h is the height.

The rectangular prism in question has the following dimensions:

Length (l) = 3 cm

Width (w) = 5 cm

Height (h) = 4 cm

Using the formula for volume, we get:

V = l x w x h

= 3 cm x 5 cm x 4 cm

= 60 cm³

Therefore, the volume of the rectangular prism is 60 cm³.

The answer is (d) 60 cm³.

I Hope This Helps!

Answer:

Step-by-step explanation:

We can use the simple interest formula to solve this problem. The formula is:

I = P * r * t

Where:

I = Interest earned

P = Principal (initial amount of money)

r = Interest rate per year (as a decimal)

t = Time (in years)

From the problem statement, we know that:

I = $80.00

r = 0.04 (4% as a decimal)

t = 8 years

Substituting these values into the formula, we get:

$80.00 = P * 0.04 * 8

Simplifying:

$80.00 = 0.32P

Dividing both sides by 0.32, we get:

P = $250.00

Therefore, the principal is $250.00.

Step-by-step explanation:

p-grams have equal opposite side lengths

soooo  

 5x+7   =  27  

               x = 4

then 22x = 22(4) = 88  units      ( this is also AB length)

Answer:The first table is linear.  The other are not linear.

Step-by-step explanation:

The conditions does the function f(x) to meet in order to be able to use the integral test to verify convergence or divergence is

1) f(x) must be continuous, positive, and decreasing for all x greater than some fixed value N.

2) The series to be tested must have non-negative terms.

3) The integral of f(x) from N to infinity must converge or diverge.

To use the integral test to verify the convergence or divergence of an infinite series, the following conditions must be met for the function f(x)

1) f(x) must be continuous, positive, and decreasing for all x greater than some fixed value N.

2) The series to be tested must have non-negative terms.

3) The integral of f(x) from N to infinity must converge or diverge.

If these conditions are met, then the integral test can be used to determine whether the series converges or diverges. Specifically, if the integral of f(x) converges, then the series converges. On the other hand, if the integral of f(x) diverges, then the series also diverges.

Learn more about integral test here

brainly.com/question/28157842

#SPJ4

One of the advantages of buying a franchise is that the purchaser has access to a proven business system is true.

Explanation:

A franchise is a company's business model and brand name that it allows to be used by third parties in exchange for a fee. The individual or entity who pays the fee is referred to as the franchisee. The purchaser of the franchise receives a licence to use the franchisor's trade name, business systems, operational procedures, goods, and other intellectual property, among other things. The franchisee is also required to follow certain operational protocols and sales/marketing strategies, as well as purchase products from the franchisor. For various reasons, a franchise is often viewed as a low-risk business opportunity for a potential business owner. Among the numerous advantages of buying a franchise, the ability to access a proven business system is one of the most important.

                         A proven business system is a set of guidelines, operational procedures, marketing and sales strategies, and other tools that have been shown to be effective for a particular franchise. By using a proven business system, the franchisee is less likely to fail and more likely to succeed. As a result, a franchisee's revenue stream will be more stable, allowing for long-term growth and success.

To know more about franchise:

https://brainly.com/question/20358963

#SPJ11

The Polynomials that are listed in the question are the options labelled;

B, C, E

A polynomial is a mathematical expression that consists of variables, coefficients, and exponents.

The variables represent unknown values, while the coefficients are constants that multiply the variables or their exponents. The exponents indicate the power to which the variables are raised.

Polynomials can be added, subtracted, multiplied, and divided to create more complex expressions, and they are used in a wide range of mathematical applications, including algebra, calculus, and geometry.

Learn more about Polynomials:https://brainly.com/question/11536910

#SPJ1

As a result, 37.6 is the number of x in the provided diagram as The fact that angles x and z are opposite angles in a parallelogram.

A triangle is a two-dimensional polygon with three straight edges and three angles in geometry. The most basic polygon, it serves as the foundation for more complicated shapes. Triangles can be categorized based on the lengths of their sides and the angles in their angles. Triangles can be categorized as either equilateral (all three sides are equal) or isosceles (two sides are equal) or scalene (three sides are equal) (all three sides are different lengths). Triangles can be categorized as acute, right, or oblique based on how many angles they have. Acute triangles have three angles that are all less than 90 degrees (one angle is greater than 90 degrees).

given

x + y + z = 180

By replacing y = 3x - 8 we obtain:

x + (3x - 8) + z = 180

When we simplify this solution, we obtain:

4x - 8 + z = 180

8 is added to both parts to arrive at:

4x + z = 188

The fact that angles x and z are opposite angles in a parallelogram, indicating that they are identical, can be used to determine the value of x. As a result, we have:

x = z

The result of adding x = z to the formula 4x + z = 188 is:

5x = 188

When we multiply both sides by 5, we get:

x = 37.6

As a result, 37.6 is the number of x in the provided diagram as The fact that angles x and z are opposite angles in a parallelogram.

To know more about triangle visit:

https://brainly.com/question/2773823

#SPJ1

Answer:

6(2x - 1)(x + 2).

Step-by-step explanation:

12x²+18x-12

= 6(2x^2 + 3x - 2)

= 6 (2x - 1)(x + 2).

General solution = CF + PS= c₁ cos 5x + c₂ sin 5x - (2/25) tan 5x= C sin (5x) + D cos (5x) - (2/25) ln(sec(5x) + tan(5x)), where C = c₂ and D = c₁.

Explanation:

The general solution of the given non-homogeneous differential equation: y"(x) + 25y(x) = 2tan 5x isy (x) = C sin (5x) + D cos (5x) - (2/25) ln(sec(5x) + tan(5x)).

First of all, we need to find the complementary function(CF) of the differential equation to find the general solution.To find the complementary function (CF),

we set the non-homogeneous term to 0.y" (x) + 25y (x) = 0T

his is a homogeneous differential equation with the characteristic equation: r² + 25 = 0Solving this quadratic equation gives:r = ± 5i

Hence, the complementary function is given by:CF = c₁ cos 5x + c₂ sin 5xwhere c₁ and c₂ are constants of integration.

Now, we find the particular solution (PS) of the given non-homogeneous differential equation using the method of undetermined coefficients.

Given, y" (x) + 25 y (x) = 2 tan 5x

For PS, we assume that y = A tan 5x + B

where A and B are constants to be determined.Substituting this in the given equation, we get:10A sec² 5x + 25(A tan 5x + B) = 2 tan 5x

Simplifying this equation, we get:10A sec² 5x + 25A tan 5x + 25B = 2 tan 5x⇒ 10A sec² 5x + 23A tan 5x + 25B = 0

Comparing the coefficients of tan 5x and sec² 5x on both sides, we get:A = -2/25 and B = 0

Hence, the particular solution is given by:PS = - (2/25) tan 5xNow, the general solution of the given non-homogeneous differential equation is given by

:GS = CF + PS= c₁ cos 5x + c₂ sin 5x - (2/25) tan 5x= C sin (5x) + D cos (5x) - (2/25) ln(sec(5x) + tan(5x)), where C = c₂ and D = c₁.

To know more about non homogeneous solutions:

https://brainly.com/question/16921211

#SPJ11