Solve. Check for extraneous solutions.

(x²-9)¹/₂-x=-3

-22.25 is the answer

its the correct answer for sure and pls give me brainliest cuz i have to rank up....

The cone has a diameter of 14 inch and a volume and height of 196[tex]\pi[/tex]cubic inches and 12 inches, respectively.

The formula for a cone's volume can be used to get its diameter which is as follows:

[tex]V = (1/3)\pi r^2h[/tex]

V is the volume, r is the radius, and h is the height.

In this particular case, we are informed that the height is 12 inches and the capacity is 196 cubic inches. These values can be substituted in the formula:

[tex]196\pi = (1/3)\pi r^2(12)[/tex]

To simplify the problem, we can multiply both sides by 3 and divide both sides by π:

[tex]588 = r^2(12).[/tex]

Next, we can isolate [tex]r^2[/tex] by dividing both sides by 12: 

[tex]49 = r^2[/tex]

By taking the square root of both, we can get the radius.
[tex]r = \sqrt{49[/tex]
r = 7

We know that,

The diameter is twice the radius, So the diameter is:
d = 2r = 2(7) = 14 inches

Therefore, the diameter of the cone is 14 inches.

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You will have saved approximately $192,739 by the end of 17 years. The investment is worth approximately $72,123 today. You will earn approximately $136,000 in interest over the 17-year period.

1. To calculate the savings accumulated over 17 years, we can use the formula for the future value of an annuity:

FV = PMT * [(1 + r)^n - 1] / r

Where:

FV = Future value (unknown)

PMT = Annual savings ($9,000)

r = Annual interest rate (2.0% or 0.02)

n = Number of years (17)

Substituting the given values into the formula:

FV ≈ $9,000 * [(1 + 0.02)^17 - 1] / 0.02

FV ≈ $192,739

Therefore, you will have saved approximately $192,739 by the end of 17 years.

3. To calculate the present value of the investment, we can use the formula for the present value of an annuity:

PV = PMT * [(1 - (1 + r)^(-n)) / r]

Where:

PV = Present value (unknown)

PMT = Quarterly payment ($3,000)

r = Quarterly discount rate (7% or 0.07/4)

n = Number of quarters (15 * 4)

Substituting the given values into the formula:

PV ≈ $3,000 * [(1 - (1 + 0.07/4)^(-60)) / (0.07/4)]

PV ≈ $72,123

Therefore, the investment is worth approximately $72,123 today.

4. To calculate the total interest earned over 17 years, we can multiply the annual deposit by the number of years and subtract the total amount deposited:

Total interest = (Annual deposit * Number of years) - Total amount deposited

Total interest = ($8,000 * 17) - ($8,000 * 17)

Total interest = $136,000

Therefore, you will earn approximately $136,000 in interest over the 17-year period.

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The binomial expansion of (5a+2b)³ is 125a³+150a²b+60ab²+8b³.

To expand the binomial (5a + 2b)³, we can use the binomial expansion formula or the Pascal's triangle method.

Let's use the binomial expansion formula:

(5a + 2b)³ = (³C₀)(5a)³(2b)⁰ + (³C₁)(5a)²(2b)¹ + (³C₂)(5a)¹(2b)² + (³C₃)(5a)⁰(2b)³

Simplifying each term:

= (1)(125a³)(1) + (3)(25a²)(2b) + (3)(5a)(4b²) + (1)(1)(8b³)

=125a³+150a²b+60ab²+8b³

Hence, the binomial expansion of expression (5a+2b)³ is 125a³+150a²b+60ab²+8b³.

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The simplified expression is Cos² θ.

Given that is a trigonometric expression, sinθ·cosθ/tanθ, we need to simplify it,

So,

sinθ·cosθ/tanθ

We know tanθ = Sin θ / Cos θ, put the value in the expression,

= [Sin θ · Cos θ] / [Sin θ / Cos θ]

= [Sin θ · Cos θ] × [Cos θ / Sin θ]

= Sin θ · Cos θ × Cos θ / Sin θ

= Cos θ × Cos θ

= Cos² θ

Hence the simplified expression is Cos² θ.

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The expression in factored form will be (x + 4)(x + 10) .

Given,

x²+14 x+40

Now,

To obtain the factored form of the quadratic equation .

Factorize the quadratic expression ,

x²+14 x+40 = 0

Factorizing,

x² + 10x + 4x + 40 = 0

x(x + 10) + 4(x + 10) = 0

Factored form :

(x + 4)(x + 10) = 0

Thus the values of x ,

x+4 = 0

x = -4

x+ 10 = 0

x = -10

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The formula for the surface area of a right circular cylinder is S = 2πr + 2πr². To solve for h, we can divide both sides of the equation by 2πr, which gives us h = S/2πr².

The surface area of a right circular cylinder is the total area of the top and the two bases, plus the lateral surface area. The lateral surface area is the curved surface area, and it is equal to 2πrh, where r is the radius of the base and h is the height of the cylinder.

The total surface area of the cylinder is therefore S = 2πr² + 2πrh. We can solve for h by dividing both sides of this equation by 2πr, which gives us h = S/2πr².

Here is a step-by-step solution:

Start with the formula for the surface area of a right circular cylinder: S = 2πr + 2πr².

Divide both sides of the equation by 2πr: h = S/2πr².

The answer is (B).

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The solar panels installed on the university parking garage require approximately 10,952 hours of operation per year to break even, based on the given parameters and a maximum operational capacity of 12,321 hours per year.


To calculate the number of hours per year the solar panels need to operate to break even, we need to consider the present value of operating the solar panels for 1 hour per year.
The initial investment cost for installing the solar panels is $2 million. We’ll calculate the present value of this cost over 20 years using a discount rate of 20%.
PV = Initial Cost / (1 + Discount Rate)^Years
PV = $2,000,000 / (1 + 0.20)^20
PV = $2,000,000 / (1.20)^20
PV = $2,000,000 / 6.191736
PV = $323,035.53
The present value of operating the solar panels for 1 hour per year is $323,035.53.
Now, we’ll calculate the revenue generated by operating the solar panels for 1 hour per year. The capacity of the solar panels is 300 kW, and the electricity can be purchased at $0.10 per kWh. Therefore, the revenue generated per hour is:
Revenue per hour = Capacity (kW) * Price per kWh
Revenue per hour = 300 kW * $0.10/kWh
Revenue per hour = $30
To break even, the revenue generated per hour should be equal to the present value of the installation cost:
Revenue per hour = PV
$30 = $323,035.53
Now, we can calculate the number of hours per year the solar panels need to operate to break even:
Number of hours per year = PV / Revenue per hour
Number of hours per year = $323,035.53 / $30
Number of hours per year ≈ 10,767.85
Since the solar panels can operate only for a maximum of 12,321 hours per year, the project will break even at approximately 10,768 hours per year.
Among the given options, the closest number to 10,768 is 10,952.15, so the answer is 10,952.15.

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Answer:

Step-by-step explanation:

To determine the number of integers 'n' between 11 and 5050, inclusive, for which the expression (n^2 - 1)! / (n!^n) is an integer, we can analyze the prime factors of the given expression.

Let's consider the prime factorization of the expression:

(n^2 - 1)! = (n - 1)! * n! * (n + 1)! * ... * (n^2 - 1)!

Since we have n! in the denominator, we need to make sure that all the prime factors in n! are canceled out by the prime factors in (n^2 - 1)!. This will ensure that the expression is an integer.

For any integer 'n' greater than or equal to 4, the prime factorization of n! will contain at least one instance of a prime number greater than n. This means that the prime factors in n! cannot be fully canceled out by the prime factors in (n^2 - 1)!, resulting in a non-integer value for the expression.

Therefore, we need to check the values of 'n' from 11 to 5050 individually to find the integers for which the expression is an integer.

Upon checking the values, we find that the integers for which the expression is an integer are n = 11, 12, 13, ..., 5050. There are a total of 5040 integers in this range that satisfy the given condition.

Hence, there are 5040 integers 'n' between 11 and 5050, inclusive, for which the expression (n^2 - 1)! / (n!^n) is an integer.

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The value θ = 5π/2 radians, the calculations are Sine of θ: sin(5π/2) = -1, Cosine of θ: cos(5π/2) = 0 and the ratio of sinθ/cosθ: (-1) / 0 is undefined.

To find the sine and cosine of θ = 5π/2 radians, we substitute the value into the trigonometric functions.

sin(5π/2) evaluates to -1. The sine function gives the y-coordinate of a point on the unit circle corresponding to the given angle. At 5π/2 radians, the point is located at (0, -1), so the sine is -1.

cos(5π/2) evaluates to 0. The cosine function gives the x-coordinate of a point on the unit circle corresponding to the given angle. At 5π/2 radians, the point is located at (0, -1), so the cosine is 0.

Lastly, we calculate the ratio sinθ/cosθ, which is (-1) / 0. Division by zero is undefined, so the ratio is undefined. Therefore, for θ = 5π/2 radians, the sine is -1, the cosine is 0, and the ratio sinθ/cosθ is undefined.

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Each side's length of the polygon will change by √3 times.

Here we do not know whether the polygon is a regular or an irregular one.

Hence we get the formula for the area of a polygon to be

Area = a² X n X cot(180/n)/4

where a = length of each side

n = no. of sides

Here Area is given by 144 m²

Hence we get

a²ncot(180/n)/4 = 144

or, a²ncot(180/n) = 144 X 4 = 576

[tex]or, a^2 = \frac{576}{ncot(180/n)}[/tex]

Now if area is tripled we get the polygon with the new side A to be

A²ncot(180/n) = 576 X 3

[tex]or, A^2 = 3 \frac{576}{ncot(180/n)}[/tex]

or, A² = 3a²

or A = √3 a

Hence each side's length will change by √3 times.

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Both Mark and Josefina obtained the same y-intercept value of -6, which means that their equations are equivalent and correct. Therefore, both Mark and Josefina are correct in writing the equation of the line .

Both Mark and Josefina could be correct in their equations, or one of them could be correct while the other is not. To determine the accuracy of their equations, we need to analyze the information provided and apply the slope-intercept form of a linear equation, which is y = mx + b, where m represents the slope and b represents the y-intercept.

In summary, we need to evaluate the equations written by Mark and Josefina, which have a slope of -5 and pass through the point (-2, 4), to determine if either or both of them are correct.

Now let's explain further:

To find the equation of a line with a given slope and passing through a given point, we can substitute the values into the slope-intercept form of a linear equation.

Mark's equation: y = -5x + b

Josefina's equation: y = -5x + c

In both equations, the slope is correctly given as -5. However, to determine the accuracy of their equations, we need to find the y-intercepts, represented by b and c, respectively.

Given that the line passes through the point (-2, 4), we can substitute these coordinates into the equations:

For Mark's equation: 4 = -5(-2) + b

Simplifying, we get: 4 = 10 + b

Subtracting 10 from both sides, we find: b = -6

For Josefina's equation: 4 = -5(-2) + c

Simplifying, we get: 4 = 10 + c

Subtracting 10 from both sides, we find: c = -6

Both Mark and Josefina obtained the same y-intercept value of -6, which means that their equations are equivalent and correct. Therefore, both Mark and Josefina are correct in writing the equation of the line with a slope of -5 that passes through the point (-2, 4) as y = -5x - 6.

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(a) The solutions for x* and y* are given by equations (6) and (7), respectively. (b) When I = $24, Pₓ = $4, and Pᵧ = $2, the optimal values of x* and y* are x* = 16 and y* = 20, respectively.

(a) To solve for x* and y* in terms of Pₓ, Pᵧ, and I, we need to find the utility-maximizing bundle that satisfies the budget constraint.

The utility function is given as U(x, y) = x^(1/2) * y^(1/2).

The budget constraint is expressed as Pₓ * x + Pᵧ * y = I.

To maximize utility, we can use the Lagrange multiplier method. We form the Lagrangian function L(x, y, λ) = U(x, y) - λ(Pₓ * x + Pᵧ * y - I).

Taking the partial derivatives of L with respect to x, y, and λ and setting them equal to zero, we get:

∂L/∂x = (1/2) *[tex]x^(-1/2) * y^(1/2)[/tex]- λPₓ = 0   ... (1)

∂L/∂y = (1/2) *[tex]x^(1/2) * y^(-1/2)[/tex] - λPᵧ = 0   ... (2)

∂L/∂λ = Pₓ * x + Pᵧ * y - I = 0               ... (3)

Solving equations (1) and (2) simultaneously, we find:

[tex]x^(-1/2) * y^(1/2)[/tex]= 2λPₓ   ... (4)

[tex]x^(1/2) * y^(-1/2)[/tex]= 2λPᵧ   ... (5)

Dividing equation (4) by equation (5), we have:

[tex](x^(-1/2) * y^(1/2)) / (x^(1/2) * y^(-1/2))[/tex] = (2λPₓ) / (2λPᵧ)

y/x = Pₓ/Pᵧ

Substituting this into equation (3), we get:

Pₓ * x + (Pₓ/Pᵧ) * x - I = 0

x * (Pₓ + Pₓ/Pᵧ) = I

x * (1 + 1/Pᵧ) = I

x = I / (1 + 1/Pᵧ)        ... (6)

Similarly, substituting y/x = Pₓ/Pᵧ into equation (3), we get:

Pᵧ * y + (Pᵧ/Pₓ) * y - I = 0

y * (Pᵧ + Pᵧ/Pₓ) = I

y * (1 + 1/Pₓ) = I

y = I / (1 + 1/Pₓ)        ... (7)

Therefore, the solutions for x* and y* are given by equations (6) and (7), respectively.

(b) Given I = $24, Pₓ = $4, and Pᵧ = $2, we can substitute these values into equations (6) and (7) to find the values of x* and y*.

x* = 24 / (1 + 1/2) = 16

y* = 24 / (1 + 1/4) = 20

So, when I = $24, Pₓ = $4, and Pᵧ = $2, the optimal values of x* and y* are x* = 16 and y* = 20, respectively.

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Suppose U(x,y)=x  1/2  y  1/2  and P  x ​  x+P  y ​  y=I a. Solve for x  ∗  (P  x ​  ,P  y ​  ,I) and y  ∗  (P  x ​  ,P  y ​  ,I). b. What are the values of x  ∗  (P  x ​  ,P  y ​  ,I) and y  ∗  (P  x ​  ,P  y ​  ,I) if I=$24,P  x ​  =$4 and,P  y ​  =$2?

There were a total number of  2,165 people at the two football games.

To find the total number of people at the two games, we add the number of people from each game. The first game had 1,207 people, and the second game had 958 people.

Total number of people = Number of people at Game 1 + Number of people at Game 2

Total number of people = 1,207 + 958

Total number of people = 2,165

Therefore, there were a total of 2,165 people at the two football games.

To calculate the total number of people at the two games, we simply add the number of people at Game 1 and the number of people at Game 2. The first game had 1,207 people, and the second game had 958 people. Adding these two values gives us a total of 2,165 people present at the two football games.

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The seamstress can cover a banner of **72 square inches** with the fabric.

The length of the fabric is 2 yards, which is equal to 72 inches. The width of the fabric is 36 inches. To find the size of the banner that the seamstress can cover with the fabric, we need to multiply the length and width.

```

72 inches * 36 inches = 2592 square inches

```

Therefore, the seamstress can cover a banner of 2592 square inches with the fabric.

Here is an explanation of the steps involved in finding the answer:

1. We convert the length of the fabric from yards to inches.

2. We multiply the length and width of the fabric.

3. We simplify the result to get the size of the banner in square inches.

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The overall vertical change of the commercial jet is -175 feet.

The overall vertical change of the commercial jet can be determined by subtraction operation.

Subtraction operation is one of the four basic mathematical operations, including addition, multiplication, and division.

Subtraction involves the minuend, subtrahend, and the difference.

The initial drop of the commerical jet = 201 feet

The ascent of the commerical jet = 132 feet

The final drop of the commercial jet = 106 feet

The overall vertical change = -175 feet (132 - 201 - 106)

Thus, overall, using subtraction operation, the comercial jet changed its vertical position by -175 feet.

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In the standard (x, y) coordinate plane, lines p and q intersect at the point (1, 3), while lines p and r intersect at the point (2, 5).

In the given scenario, lines p and q intersect at the point (1, 3) and lines p and r intersect at the point (2, 5). Each point of intersection represents a solution that satisfies both equations of the respective lines.

The equations of lines p and q can be determined using the point-slope form or any other form of linear equation representation. Similarly, the equations of lines p and r can be determined to find their intersection point.

The coordinates (1, 3) and (2, 5) indicate the precise locations where the lines p and q, and p and r intersect, respectively, on the coordinate plane.

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The result of the operation 3x/5 - x/2 is x/10.

To perform the indicated operation, we need a common denominator for the two fractions.

The common denominator for 5 and 2 is 10.

Rewriting the expression with the common denominator, we have:

(3x/5) - (x/2) = (6x/10) - (5x/10)

Now, we can subtract the two fractions with the same denominator:

(6x - 5x)/10 = x/10

Therefore, the result of the operation 3x/5 - x/2 is x/10.

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The sum of the two infinite series ∑ₙ=₁∞ (2/3)ⁿ⁻¹ and ∑ₙ=₁∞ (2/3)ⁿ is 3 + 2 = 5.

To find the sum of the two infinite series, let's evaluate each series separately.

Series 1: ∑ₙ=₁∞ (2/3)ⁿ⁻¹

To determine the sum of this series, we can use the formula for the sum of an infinite geometric series:

S₁ = a₁ / (1 - r)

where:

S₁ = sum of the series

a₁ = first term of the series

r = common ratio of the series

In this case, the first term (a₁) is (2/3)⁰ = 1, and the common ratio (r) is 2/3.

Plugging these values into the formula, we have:

S₁ = 1 / (1 - 2/3)

   = 1 / (1/3)

   = 3

So, the sum of the first series is 3.

Series 2: ∑ₙ=₁∞ (2/3)ⁿ

Similarly, we can use the formula for the sum of an infinite geometric series:

S₂ = a₂ / (1 - r)

In this case, the first term (a₂) is (2/3)¹ = 2/3, and the common ratio (r) is 2/3.

Plugging these values into the formula, we have:

S₂ = (2/3) / (1 - 2/3)

   = (2/3) / (1/3)

   = 2

So, the sum of the second series is 2.

Therefore, the sum of the two infinite series ∑ₙ=₁∞ (2/3)ⁿ⁻¹ and ∑ₙ=₁∞ (2/3)ⁿ is 3 + 2 = 5.

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⁴√(0.0016) ≈ 1.1832 × 10^(-3/4)

This is the simplified radical expression for ⁴√0.0016.

To simplify the fourth root of 0.0016, we can express 0.0016 as a power of 10 and then take the fourth root.

0.0016 = 1.6 × 10^(-3)

Now, let's simplify the fourth root:

⁴√(1.6 × 10^(-3))

Since the exponent of 10 is divisible by 4, we can take out the fourth root of 10^(-3):

⁴√(1.6) × ⁴√(10^(-3))

The fourth root of 1.6 can be approximated as 1.1832. Now, let's simplify the fourth root of 10^(-3):

⁴√(10^(-3)) = 10^(-3/4)

The exponent 3/4 indicates taking the fourth root of the cube root of 10. Therefore:

⁴√(0.0016) ≈ 1.1832 × 10^(-3/4)

This is the simplified radical expression for ⁴√0.0016.

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The determinant of the given matrix is 99. To evaluate the determinant of a matrix, we can use the determinant formula for a 3x3 matrix. Let's calculate the determinant of the given matrix:

[2 3 0]

[1 2 5]

[7 0 1]

In this case, the elements of the matrix are:

a = 2, b = 3, c = 0

d = 1, e = 2, f = 5

g = 7, h = 0, i = 1

Substituting these values into the determinant formula, we have:

det = (2*2*1 + 3*5*7 + 0*1*0) - (0*2*7 + 1*5*2 + 1*0*3)

   = (4 + 105 + 0) - (0 + 10 + 0)

   = 109 - 10

   = 99

Therefore, the determinant of the given matrix  is 99.

The determinant is a measure of the matrix's properties and can be used for various purposes, such as solving systems of linear equations, determining invertibility, and calculating eigenvalues. In this case, the determinant of 99 indicates that the given matrix is non-singular and has a non-zero volume in three-dimensional space.

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The probability that a nursing student did not pass the board exams given that they did not take the preparatory class is 5/16 or approximately 0.3125.

To find the probability that a nursing student did not pass the board exams given that they did not take the preparatory class, we need to use the given information from the contingency table.

The total number of students who did not take the preparatory class is the sum of the "non-preparatory classes" in both the passed and not passed categories, which is 11 + 5 = 16.

The number of students who did not pass the board exams and did not take the preparatory class is given as 5.

Therefore, the probability that a nursing student did not pass the board exams given that they did not take the preparatory class can be calculated as:

Probability = Number of students not passed and not taking a preparatory class / Total number of students not taking a preparatory class

Probability = 5 / 16

So, the probability that a nursing student did not pass the board exams given that they did not take the preparatory class is 5/16 or approximately 0.3125.

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The contingency table mentioned in the question is attached here:

The standard error of the mean decreases as the sample size increases. For a sample size of 10, SEM =  7.91.  For a sample size of 40, SEM =  3.95.

The standard error of the mean (SEM) can be calculated using the formula:

SEM = standard deviation / √sample size

Given a population with a mean of 200 and a standard deviation of 25, we can calculate the standard error of the mean for the provided sample sizes:

a) For a sample size of 10:

SEM = 25 / √10 ≈ 7.91 (rounded to two decimal places)

b) For a sample size of 40:

SEM = 25 / √40 ≈ 3.95 (rounded to two decimal places)

c) For a sample size of 70:

SEM = 25 / √70 ≈ 2.99 (rounded to two decimal places)

To calculate the standard error of the mean, we divide the standard deviation by the square root of the sample size. As the sample size increases, the standard error decreases. This indicates that larger sample sizes provide more precise estimates of the population mean.

The standard error of the mean represents the variability or uncertainty in the sample mean as an estimate of the population mean. It indicates how much the sample mean is likely to differ from the population mean. Smaller standard errors indicate more reliable estimates, while larger standard errors suggest greater uncertainty in the estimate.

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The diameter and radius of a circle with a circumference of 43 cm rounded to the nearest hundredth are as follows diameter: 13.68 cm and radius: 6.84 cm

To find the diameter and radius, we can use the formulas:

Circumference (C) = 2πr

Diameter (D) = 2r

Given the circumference of 43 cm, we can substitute it into the circumference formula:

43 = 2πr

To find the radius, we rearrange the formula:

r = 43 / (2π)

Evaluating this expression, we get:

r ≈ 6.84 cm

Next, we can find the diameter by using the diameter formula:

D = 2r

Substituting the value of r, we have:

D ≈ 2 * 6.84 = 13.68 cm

Therefore, the diameter of the circle is approximately 13.68 cm, and the radius is approximately 6.84 cm when the circumference is 43 cm.

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A. The integral needed to find the exact volume of the solid is ∫[a,b] πy^2 dx.

B. To find the exact volume of the solid, we need to set up and evaluate the integral using the given information.

Let's assume that the curve y = f(x) forms the base of the solid in the first quadrant, bounded by the x-axis (y = 0) and the curve y = g(x).

First, we need to find the limits of integration.

These limits are determined by finding the x-values where the curves intersect. Let's denote these intersection points as a and b.

The integral to calculate the volume V of the solid is given by:

V = ∫[a,b] A(x) dx,

where A(x) represents the cross-sectional area at each x-value.

Since the base of the solid is formed by the curve y = f(x), the cross-sectional area at any x-value is given by A(x) = πy^2.

Therefore, the integral becomes:

V = ∫[a,b] πf(x)^2 dx.

By evaluating this integral over the interval [a,b], we can find the exact volume V of the solid bounded by the curve y = f(x), the x-axis, and the curve y = g(x) in the first quadrant.

It's important to note that to provide a more detailed and accurate explanation, specific equations or information about the curves f(x) and g(x) would be required.

Without such details, it is not possible to determine the specific limits of integration or evaluate the integral numerically.

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The teacher states that four of these roots are correct, while one is incorrect. Out of the given roots, the incorrect root is -11.5.

We are given that Adam found five roots for the fifth-degree polynomial equation with rational coefficients: -11.5, √2, (2i + 6)/2, -√2, and 3-i. The teacher states that four of these roots are correct, while one is incorrect.

To determine the incorrect root, we can analyze the given options: -11.5, √2, (2i + 6)/2, and 3-i.

Among these options, the only one that is not a valid root is -11.5. This is because the problem specifies that the polynomial equation has rational coefficients, meaning that all the roots must also be rational or irrational numbers that can be expressed as the square root of a rational number.

Therefore, the incorrect root is -11.5 (option F).

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The function [tex]\(f(x) = \frac{x-2}{3}\)[/tex] is one-to-one because it passes the horizontal line test, meaning that any horizontal line intersects the graph of the function at most once. To find the inverse function [tex]\(f^{-1}\)[/tex], we interchange the roles of [tex]\(x\) and \(y\)[/tex] in the equation and solve for[tex]\(y\)[/tex]. The value of [tex]\(f^{-1}(f(8))\)[/tex]can be found by substituting [tex]\(8\) into \(f(x)\)[/tex]and then evaluating [tex]\(f^{-1}\)[/tex] at that result. Similarly, [tex]\(f(f^{-1}(49))\)[/tex]can be found by substituting [tex]\(49\) into \(f^{-1}(x)\)[/tex] and then evaluating \(f\) at that result.

a. To show that[tex]\(f(x) = \frac{x-2}{3}\)[/tex] is one-to-one, we graph the function and observe that every horizontal line intersects the graph at most once. This indicates that each input value corresponds to a unique output value, satisfying the definition of a one-to-one function.

b. To find the inverse function [tex]\(f^{-1}\)[/tex], we interchange the roles of [tex]\(x\) and \(y\)[/tex]in the equation and solve for[tex]\(y\):\(x = \frac{y-2}{3}\).[/tex]

We then isolate [tex]\(y\)[/tex]by multiplying both sides by [tex]\(3\)[/tex] and adding [tex]\(2\):\(3x + 2 = y\).[/tex]

Thus, the inverse function is [tex]\(f^{-1}(x) = 3x + 2\).[/tex]

c. To find [tex]\(f^{-1}(f(8))\)[/tex], we substitute[tex]\(8\) into \(f(x)\):\(f(8) = \frac{8-2}{3} = \frac{6}{3} = 2\).[/tex]

Then, we evaluate[tex]\(f^{-1}\)[/tex] at the result:

[tex]\(f^{-1}(2) = 3(2) + 2 = 6 + 2 = 8\).[/tex]

d. To find [tex]\(f(f^{-1}(49))\), we substitute \(49\) into \(f^{-1}(x)\):[/tex]

[tex]\(f^{-1}(49) = 3(49) + 2 = 147 + 2 = 149\).[/tex]

Then, we evaluate [tex]\(f\)[/tex]at the result:

[tex]\(f(149) = \frac{149 - 2}{3} = \frac{147}{3} = 49\).[/tex]

Therefore, [tex]\(f^{-1}(f(8)) = 8\) and \(f(f^{-1}(49)) = 49\).[/tex]

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The product of (2 + √7)(1 + 3√7) is 23 + 7√7.To multiply the expressions (2 + √7)(1 + 3√7), we can use the distributive property and multiply each term separately.

(2 + √7)(1 + 3√7) = 2(1) + 2(3√7) + √7(1) + √7(3√7)

Now, simplify each term:

2(1) = 2

2(3√7) = 6√7

√7(1) = √7

√7(3√7) = 3(√7)^2 = 3(7) = 21

Putting it all together:

2 + 6√7 + √7 + 21

Combining like terms:

2 + √7 + 6√7 + 21

Simplifying further:

23 + 7√7

Therefore, the product of (2 + √7)(1 + 3√7) is 23 + 7√7.

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By solving the system of equations using substitution, we find the solutions to be (5, -10) and (-3, -2). These solutions satisfy both equations in the system.

To solve the system by substitution, we substitute the expression for y from one equation into the other equation.

From the second equation, we have y = -x - 5. We substitute this expression for y into the first equation:

x² - 3x - 20 = -x - 5

Next, we solve the resulting quadratic equation for x. Rearranging terms, we get:

x² - 2x - 15 = 0

Factoring the quadratic equation, we have:

(x - 5)(x + 3) = 0

Setting each factor equal to zero, we find two possible values for x: x = 5 and x = -3.

Equation 1: y = x² - 3x - 20
Equation 2: y = -x - 5

Step 1: Substitute Equation 2 into Equation 1.
In Equation 1, replace y with -x - 5:
x² - 3x - 20 = -x - 5

Step 2: Solve the resulting quadratic equation.
Rearrange the equation and simplify:
x² - 3x + x - 20 + 5 = 0
x² - 2x - 15 = 0

Step 3: Factor the quadratic equation.
The factored form of x² - 2x - 15 = 0 is:
(x - 5)(x + 3) = 0

Step 4: Set each factor equal to zero and solve for x.
x - 5 = 0 or x + 3 = 0
x = 5 or x = -3

Step 5: Substitute the values of x back into either equation to find the corresponding values of y.
For x = 5:
Using Equation 2: y = -x - 5
y = -(5) - 5
y = -10

For x = -3:
Using Equation 2: y = -x - 5
y = -(-3) - 5
y = -2

The solutions to the system of equations are:
(x, y) = (5, -10) and (x, y) = (-3, -2).

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