for each number x in a finite field there is a number y such x y=0 (in the finite field). true false

The trigonometric substitution to find the indefinite integral is x = 8sec(θ).

Explanation:

To find the trigonometric substitution for the given integral, follow these steps:

Step 1: we first notice that the expression inside the square root can be written as a difference of squares:

x^2 - 64 = (x^2 - 8^2)

Step 2: substitute x = 8sec(θ), which leads to the following substitutions:

x^2 = 64sec^2(θ)
x^2 - 64 = 64 tan^2(θ)

And
dx = 8sec(θ)tan(θ) dθ

Step 3: With these substitutions, the given integral can be rewritten as:

∫ x^2(x^2 - 64)^3/2 dx = ∫ (64sec^2(θ))(64tan^2(θ))^3/2 (8sec(θ)tan(θ)) dθ

Step 4: Simplifying this expression, we get:

∫ 2^18sec^3(θ)tan^4(θ) dθ

Therefore, the trigonometric substitution to find the indefinite integral is x = 8sec(θ).

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To graph the quadratic function y=-2x^2 using the given values of x, one can create a table with two columns: one for x and the other for y. Starting with x=-2, we can substitute this value into the equation to find the corresponding value of y, which is y=-8. Similarly, by substituting -1, 0, 1, and 2 into the equation, we can find corresponding values of y as 2, 0, -2, and -8, respectively. By plotting these points on a graph and connecting them, we get a downward facing parabola with its vertex at (0,0).

B) 30 - 75x

This is because of the distributive property.

In the expression 3(10-25x) you have to multiply 3 by the numbers inside.

3 x 10 = 30

3 x 25x = 75x

Then, we keep the subtraction sign. The final answer is 30 - 75x.

When dealing with exponential functions given by y = (a + c)^x, where the constant 'c' is used to achieve horizontal shifts, there are particular effects on the domain, range, and asymptotes

The function's output values, or range, persist unchanged since it can assume any positive value for input from the vertical axis. Similarly, factorizing by adding constants does not impact the function's input values, otherwise known as the domain.

While horizontally shifting the exponentially-decreasing function, its horizontal asymptote remains unaffected; however, the positional shift depends on the magnitude and direction of said diasporic events. Equivalently, rightward shifts append positively and leftward motions take away from the aforementioned translation distance.

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We have computed the Taylor polynomials of the given function f (x) = cos (4x), using around 6 decimals for approximation. These polynomials can then be used to approximate the given function.

Function is a block of code that performs a specific task. It can accept input parameters and return a value or a set of values. Functions are used to break down a complex problem into simple, manageable tasks. They also help improve code readability and re-usability. By using functions, you can write code more efficiently and easily maintain your program.

The Taylor series of a given function is a polynomial approximation of that function, derived using derivatives. In this case, we are asked to compute the Taylor polynomial for the function f (x) = cos (4x).

The Taylor polynomials of f are as follows:

p0(x) = 1

p1(x) = 1 - 8x2

p2(x) = 1 - 8x2 + 32x4

p3(x) = 1 - 8x2 + 32x4 - 128x6

p4(x) = 1 - 8x2 + 32x4 - 128x6 + 512x8

For any approximations, we can use around 6 decimals. For instance, if x = 0.5, then p4(0.5) = 0.988377, which is an approximation of the actual value of f (0.5), which is 0.98879958.

In conclusion, we have computed the Taylor polynomials of the given function f (x) = cos (4x), using around 6 decimals for approximation. These polynomials can then be used to approximate the given function.

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The correct answer is option c. i.e. B = 37.2°, b = 264.3, c = 326.9.

To solve the triangle, we can use the given information:
1. A = 11.2°
2. C = 131.6°
3. a = 84.9

Step 1: Find angle B.
Since the sum of angles in a triangle is 180°, we can calculate angle B as follows:
B = 180° - (A + C) = 180° - (11.2° + 131.6°) = 180° - 142.8° = 37.2°

Step 2: Find side b.
We can use the Law of Sines to find side b.
a / sin(A) = b / sin(B)
84.9 / sin(11.2°) = b / sin(37.2°)

Now, solve for b:
b = (84.9 * sin(37.2°)) / sin(11.2°) ≈ 264.3

Step 3: Find side c.
Again, we can use the Law of Sines to find side c.
a / sin(A) = c / sin(C)
84.9 / sin(11.2°) = c / sin(131.6°)

Now, solve for c:
c = (84.9 * sin(131.6°)) / sin(11.2°) ≈ 326.9

So, the final answer is:
B = 37.2°, b = 264.3, c = 326.9, which corresponds to option c.

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New pump:

[tex]\text{5 hours = 1 pool}[/tex]

[tex]\text{1 hour} = \dfrac{1}{5} \ \text{pool}[/tex]

Old pump:

[tex]\text{15h = 1 pool}[/tex]

[tex]\text{1h} = \dfrac{1}{15} \ \text{pool}[/tex]

If both work together

[tex]\text{1h} = \dfrac{1}{5}+ \dfrac{1}{15}= \dfrac{4}{15} \ \text{pool}[/tex]

[tex]\dfrac{4}{15} \ \text{pool = 1 hour}[/tex]

[tex]\dfrac{1}{15} \ \text{pool} = \dfrac{1}{4} \ \text{hour}[/tex]

[tex]\dfrac{15}{15} \ \text{pool} =\dfrac{1}{4} \times15[/tex]

1 pool = 3.75 hours or 3 hours 45 mins

Answer:

C. The zeros of f(x) are -1 and 1.

y = sin(t) is indeed a solution to the differential equation (dy/dt)² = 1 - y².

We'll need to perform the following steps:

Step 1: Find the derivative of y with respect to t.
Step 2: Square the derivative and substitute it into the equation.
Step 3: Check if the equation holds true with the given function.

Step 1:
To find the derivative of y = sin(t) with respect to t, we use the basic differentiation rule for sine:
(dy/dt) = cos(t).

Step 2:
Next, we square the derivative:
(dy/dt)² = cos²(t).

Step 3:
Now we substitute this expression and y = sin(t) into the given equation:
(cos²(t)) = 1 - (sin²(t)).

Using the trigonometric identity sin²(t) + cos²(t) = 1, we can see that the equation holds true:
cos²(t) = 1 - sin²(t).

Thus, y = sin(t) is indeed a solution to the differential equation (dy/dt)² = 1 - y².

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The probability that a randomly selected person will have an IQ score of less than 80 is approximately 0.0918, or 9.18%

To find the probability that a randomly selected person will have an IQ score of less than 80, we need to consider the properties of the normal distribution, as IQ scores typically follow a normal distribution with a mean (μ) of 100 and a standard deviation (σ) of 15.

1. Calculate the z-score: The z-score represents the number of standard deviations a data point is from the mean. Use the formula:

z = (X - μ) / σ

where X is the IQ score, μ is the mean, and σ is the standard deviation.

z = (80 - 100) / 15
z = -20 / 15
z = -1.3333

2. Look up the z-score in a standard normal distribution table or use a calculator to find the corresponding probability. In this case, the probability is 0.0918.

Therefore, the probability that a randomly selected person will have an IQ score of less than 80 is approximately 0.0918, or 9.18% when rounded to four decimal places.

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The approximate P-values for the test statistics are: a) 0.045, b) 0.104, and c) 0.996.

To calculate the P-value for each test statistic, we use the chi-square distribution with degrees of freedom (df) equal to n-1.

a) For x2_0 = 25.2 and n = 20, df = 19. Using a chi-square table or calculator, we find the P-value is approximately 0.045.
b) For x2_0 = 15.2 and n = 12, df = 11. The P-value is approximately 0.104.
c) For x2_0 = 4.2 and n = 15, df = 14. The P-value is approximately 0.996.

The P-values help us determine whether to reject or fail to reject the null hypothesis (H0: σ2 = 5) in favor of the alternative hypothesis (H1: σ2 < 5). The smaller the P-value, the stronger the evidence against H0.

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When each point on a plane of a two-dimensional coordinate system is decided by a distance from a reference point and an angle is taken from a reference direction, it is known as the polar coordinate system.

Polar coordinates are advantageous when the region being integrated over has a circular or symmetric shape. This is because polar coordinates use angles and radii to describe points in a two-dimensional plane, which aligns well with circular and symmetric shapes. Additionally, polar coordinates can simplify the integrand, as some functions are more easily expressed in terms of angles and radii rather than Cartesian coordinates.

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For a one-sample t-test with df=14, there were 15 participants in the study. The degrees of freedom in any one group are equal to the sample size minus 1.


a. The hypotheses for the study are:
- Null hypothesis (H0): The mean number of racist remarks in the school is equal to the population mean (µ=7).
- Alternative hypothesis (H1): The mean number of racist remarks in the school is different from the population mean (µ≠7).

b. Using a t-table or calculator, with df=9 (10 classes - 1) and alpha=.05 (two-tailed), the critical t-value is approximately ±2.262.

c. To compute the one-sample t-test:
1. Find the sample mean (M) and sample standard deviation (s) of the observed racist remarks.
2. Compute the t-value using the formula: t = (M - µ) / (s / √n), where n is the sample size.

d. In APA format, report the t-value, degrees of freedom, and the direction of the results, for example:

"A one-sample t-test revealed a significant difference in the number of racist remarks at the school compared to the population mean, t(9) = X.XX, p < .05 (or p = Y.YY, if you have the exact p-value), with fewer racist remarks observed." (Replace X.XX and Y.YY with the calculated values.)

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The value at t0 of a 4-year annuity depends on the payment amount and the interest rate. Assuming the interest rate is 5%, the value of each of the following 4-year annuities can be calculated using the present value of an annuity formula.

In summary, at t0, the value of each 4-year annuity is approximately $36,376 for an annuity that pays $10,000 at the end of each year, $36,252 for an annuity that pays $5,000 at the end of each half-year, $36,172 for an annuity that pays $1,000 at the end of each quarter, and $36,130 for an annuity that pays $500 at the end of each month, assuming a 5% interest rate. For each annuity, the present value of an annuity formula was used to compute the value at t0, and the interest rate was changed based on the frequency of payments.

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From the histogram, we can say that the observations were selected from a normal distribution. We are 95% confident that the population mean ACT score for students taking freshman calculus is between 24.208 and 26.582. The calculus students have a higher average score of 25.395. we are 99% confident that the population standard deviation is between 8.246 and 23.639.

To check whether the observations were selected from a normal distribution, we can create a histogram or a normal probability plot.

From the histogram, it seems plausible that the observations were selected from a normal distribution, as the data appears to be roughly symmetric.

Using the given data, we can calculate a 95% confidence interval for the population mean using the formula

confidence interval = sample mean ± (critical value)(standard error)

The critical value for a 95% confidence interval with 19 degrees of freedom (n - 1) is 2.093.

The sample mean is 25.395, and the standard error can be calculated as the sample standard deviation divided by the square root of the sample size

standard error = 2.630 / sqrt(20) = 0.588

Therefore, the 95% confidence interval is

25.395 ± (2.093)(0.588)

= [24.208, 26.582]

We are 95% confident that students taking freshman calculus is between 24.208 and 26.582.

The university ACT average for entire freshmen that year was about 21. The calculus students have a higher average score of 25.395. Therefore, we can say that the calculus students performed better on the ACT than the average freshman.

To calculate a 99% confidence interval for the population standard deviation, we can use the chi-square distribution. The formula for the confidence interval is

confidence interval = [(n - 1)s^2 / χ^2_(α/2), (n - 1)s^2 / χ^2_(1-α/2)]

where n is the sample size, s is the sample standard deviation, and χ^2_(α/2) and χ^2_(1-α/2) are the chi-square values with α/2 and 1-α/2 degrees of freedom, respectively.

For a 99% confidence interval with 19 degrees of freedom, the chi-square values are 8.906 and 32.852.

Plugging in the values from the sample, we get

confidence interval = [(19)(6.615^2) / 32.852, (19)(6.615^2) / 8.906]

= [8.246, 23.639]

Therefore, we are 99% confident  that the population standard deviation is between 8.246 and 23.639. This interval assumes that the population is normally distributed. If the population is not normally distributed, the interval may not be valid.

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Answer:

Step-by-step explanation:

  A = [tex]\left[\begin{array}{cc}4&-4\\3&-2\end{array}\right][/tex]

3B = [tex]\left[\begin{array}{cc}12&12\\0&3\end{array}\right][/tex]

4 + 12 = 16 ; 12 + ( - 4) = 8

3 + 0 = 3  ; - 2 + 3 = 1

A + 3B = [tex]\left[\begin{array}{cc}16&8\\3&1\end{array}\right][/tex]

[tex](A+3B)^{-1}[/tex] = [tex]\left[\begin{array}{cc}-\frac{1}{8} &1\\\frac{3}{8} &-2\end{array}\right][/tex]

X = C ÷ ( A + 3B ) = C × [tex](A+3B)^{-1}[/tex]

X = [tex]\left[\begin{array}{cc}-1&0\\5&2\end{array}\right][/tex] × [tex]\left[\begin{array}{cc}-\frac{1}{8} &1\\\frac{3}{8} &-2\end{array}\right][/tex] = [tex]\left[\begin{array}{cc}\frac{1}{8} &-1\\\frac{1}{8} &1\end{array}\right][/tex]  

Equation of the tangent plane is: 12(x-6) + 4(y-2) - 14(z-7) = 0

Correct answer is option C.

We need to first find the partial derivatives of the given surface with respect to x, y, and z.

∂f/∂x = 2x

∂f/∂y = 2y

∂f/∂z = -2z

Then, we can evaluate them at the given point (6, 2, 7):

∂f/∂x = 2(6) = 12

∂f/∂y = 2(2) = 4

∂f/∂z = -2(7) = -14

Equation of the tangent plane is;

12(x-6) + 4(y-2) - 14(z-7) + D = 0

where D is the constant we need to find by plugging in the point (6, 2, 7):

12(6-6) + 4(2-2) - 14(7-7) + D = 0

D = 0

Equation of the tangent plane is:

12(x-6) + 4(y-2) - 14(z-7) = 0

So the correct answer is option C.

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The given equation r = 2 sin θ represents a curve in polar coordinates. To identify the surface whose equation is given, we need to convert the equation into rectangular coordinates.

To convert the equation, we use the relationships between polar and rectangular coordinates:

x = r cos θ
y = r sin θ

Substituting the given value of r = 2 sin θ, we get:

x = 2 sin θ cos θ
y = 2 sin² θ

Simplifying these equations, we get:

x = sin 2θ
y = 2 sin² θ

The resulting equations represent a surface known as a "lemniscate of Bernoulli." It is a closed, symmetric curve with two loops, resembling the shape of a figure-eight. The lemniscate of Bernoulli is named after the Swiss mathematician Jacob Bernoulli, who first studied the curve in the 17th century.

In summary, the surface whose equation is given by r = 2 sin θ is a lemniscate of Bernoulli, which can be represented by the equations x = sin 2θ and y = 2 sin² θ in rectangular coordinates.

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Answer:

38% of 94 is 38.72 simplified

Answer:

38% of 94 is 38.72 simplified

the final price will stay as $52

The value of Fc[f(x)] is: (1 - z²)/(1 + z²)²

The given function is f(x) = xeˣ.

The Fourier Sine Transform of f(x) is given by:

Fs[f(x)] = ∫₀^∞ f(x) sin(zx) dx

Taking the derivative of f(x) with respect to x, we get:

f'(x) = (x + 1) eˣ

Taking the Fourier Sine Transform of f'(x), we get:

Fs[f'(x)] = ∫₀^∞ f'(x) sin(zx) dx

= ∫₀^∞ (x + 1) eˣ sin(zx) dx

Using integration by parts, we get:

Fs[f'(x)] = [(x + 1) (-cos(zx))/z - eˣ sin(zx)/z]₀^∞

+ (1/z) ∫₀^∞ eˣ cos(zx) dx

Simplifying the above expression, we get:

Fs[f'(x)] = 2z/(z² + 1)²

The Fourier Cosine Transform of f(x) is given by:

Fc[f(x)] = ∫₀^∞ f(x) cos(zx) dx

Using integration by parts, we get:

Fc[f(x)] = [xeˣ sin(zx)/z + eˣ cos(zx)/z²]₀^∞

- (1/z²) ∫₀^∞ eˣ sin(zx) dx

Since eˣ sin(zx) is an odd function, the integral on the right-hand side is the Fourier Sine Transform of eˣ sin(zx), which we have already calculated as 2z/(z² + 1)². Substituting this value in the above expression, we get:

Fc[f(x)] = (1 - z²)/(1 + z²)²

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the quadrilateral with vertices A(0, 0), B(4, 3), C(13, -9), and D(9, -12) is a parallelogram and a rhombus

what is  quadrilateral ?

A quadrilateral is a polygon with four sides and four vertices. It is a type of geometric shape that can have various properties and characteristics depending on the lengths of its sides, the angles between those sides, and the positions of its vertices.

In the given question,

To graph the quadrilateral, we can plot the given points on a coordinate plane and connect them in order.

Quadrilateral ABCD

To prove what type of quadrilateral it is, we can use both slope and distance measurements.

First, we can calculate the slopes of each side of the quadrilateral:

Slope of AB: (3 - 0)/(4 - 0) = 3/4

Slope of BC: (-9 - 3)/(13 - 4) = -12/9 = -4/3

Slope of CD: (-12 - (-9))/(9 - 13) = -3/-4 = 3/4

Slope of DA: (0 - (-12))/(0 - 9) = 12/9 = 4/3

We can see that the slopes of opposite sides are equal: AB and CD have the same slope of 3/4, and BC and DA have the same slope of -4/3. This tells us that the quadrilateral is a parallelogram.

Next, we can calculate the distances of each side of the quadrilateral:

Distance between A and B: √((4 - 0)² + (3 - 0)²) = √(16 + 9) = √25 = 5

Distance between B and C: √((13 - 4)² + (-9 - 3)²) = √(81 + 144) = √225 = 15

Distance between C and D: √((9 - 13)² + (-12 - (-9))²) = √(16 + 9) = √25 = 5

Distance between D and A: √((0 - 9)² + (0 - (-12))²) = √(81 + 144) = √225 = 15

We can see that opposite sides have the same length: AB and CD have a length of 5, and BC and DA have a length of 15. This tells us that the parallelogram is also a rhombus.

Therefore, we have proved that the quadrilateral with vertices A(0, 0), B(4, 3), C(13, -9), and D(9, -12) is a parallelogram and a rhombus

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The line of discontinuity is x = 0 or y = 0.

We have,

To identify the line of discontinuity in the function f(x, y) = ln|x y|, we need to determine the values of x and y for which the function becomes undefined or exhibits a discontinuity.

In this case, the natural logarithm function, ln, is undefined for non-positive values.

Therefore, we need to find the values of x and y that make the expression |x y| non-positive.

The absolute value of a real number is non-positive when the number itself is zero or negative.

So, we set the expression inside the absolute value, x y, to be zero or negative:

x y ≤ 0

This inequality indicates that either x ≤ 0 and y ≥ 0, or x ≥ 0 and y ≤ 0, for the expression to be non-positive.

Hence, the line of discontinuity occurs along the line where either x ≤ 0 and y ≥ 0, or x ≥ 0 and y ≤ 0.

The equation of this line can be written as:

x ≤ 0, y ≥ 0 or x ≥ 0, y ≤ 0

This line divides the plane into two regions:

one where x ≤ 0 and y ≥ 0, and the other where x ≥ 0 and y ≤ 0.

Along this line, the function f(x, y) = ln|x y| becomes undefined or discontinuous.

Note that when x = 0 or y = 0, the function f(x, y) = ln|x y| is also undefined, but these points do not form a continuous line.

Thus,

The line of discontinuity is x = 0 or y = 0.

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The P-value for a one-tailed z-test with Ha: p > 0.4 and z = 1.49 is 0.0675, indicating insufficient evidence to reject the null hypothesis at the 0.05 level of significance.

To find the P-value for a z-test with Ha: p > 0.4 and z = 1.49, we first calculate the corresponding area under the standard normal distribution curve.

Using a standard normal table or a calculator, we find that the area to the right of z = 1.49 is 0.0675.

Since the alternative hypothesis is one-tailed, the P-value is equal to the area in the tail to the right of z = 1.49.

Therefore, the P-value for this test is 0.0675 or 6.75% (rounded to four decimal places).

This means that if the null hypothesis is true, there is a 6.75% chance of observing a sample proportion as extreme as or more extreme than the one we obtained.

Since the P-value (6.75%) is greater than the significance level (α), we fail to reject the null hypothesis at the α = 0.05 level of significance. We do not have sufficient

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The missing sides and angles of the triangle are

1. . A = 45 degrees.

2. B = 45 degrees.

3. BC = 3 and AB = 3 sqrt (2).

4. BC = 4 and AB = 4 sqrt (2).

5. BC = 9, then AB = 9 sqrt (2).

6. AB = 7V2, then BC = 7 .

7. If AB = 2√2, then AC = 2.​

An Isosceles Right Triangle is an angular design in the shape of a right triangle comprising two equal sides - forming congruent legs, and additionally, the third side (also known as the hypotenuse = c) being longer in length.

In this particular angle, the two legs are congruent to each other as well as proportional to the square root of two times one leg's length.

Mathematically, using Pythagoras' theorem

c^2 = a^2 + a^2

c^2 = 2a^2

Eventually, by taking the square root of both expressions, we obtain:

c = sqrt (2a^2)

c = a * sqrt (2)

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ANOVA is used when you have quantitative DV and IV with 3 or more levels, which means the correct answer is option A. True.


The One Way Repeated Measures ANOVA is a statistical test used to analyze the effects of an independent variable (IV) that has three or more levels on a dependent variable (DV) that is measured repeatedly on the same subjects over time. This test is appropriate when the IV is within-subjects in nature, meaning that each participant is exposed to all levels of the IV. Therefore, the statement is true as it accurately describes the use of this statistical test in relation to the IV and DV.
A. True

The One-Way Repeated Measures ANOVA is indeed used when you have a quantitative Dependent Variable (DV) and an Independent Variable (IV) with three or more levels that is within subjects in nature. In this case, the same subjects are exposed to different conditions or levels of the IV, allowing for the analysis of differences in the DV across those conditions.

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The sequence converges to: lim n→[infinity] an = ln(3) = 1.0986. So the sequence converges to 1.0986.

To determine whether the sequence converges or diverges and find the limit, we'll use the properties of logarithms and the concept of limits at infinity.

Given sequence: a_n = ln(3n² + 4) - ln(n² + 4)

Using the logarithm property, ln(a) - ln(b) = ln(a/b), we can rewrite the sequence as:

a_n = ln[(3n² + 4)/(n² + 4)]

Now, we'll find the limit as n approaches infinity:

lim (n→∞) a_n = lim (n→∞) ln[(3n² + 4)/(n² + 4)]

To evaluate this limit, we can divide both the numerator and the denominator by the highest power of n, which is n^2 in this case:

lim (n→∞) ln[(3 + 4/n²)/(1 + 4/n²)]

As n approaches infinity, the terms with n² in the denominator will approach 0:

lim (n→∞) ln[(3 + 0)/(1 + 0)] = ln(3)

So, the sequence converges, and the limit is ln(3).

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For the given equation there are 3 real solutions they are -4/3, -3, 1 , under the condition that the given equation is  x² = 1/(x+3)

The equation x²= 1/(x+3) can be restructured as
x³ + 3x² - 1 = 0.
This is a cubic equation and could be evaluated applying the cubic formula. Then, we can also apply the rational root theorem to search the rational roots of the equation.
The rational root theorem projects that if a polynomial equation has integer coefficients, then any rational root of the equation should be of the form p/q
Here,
p = factor of the constant term and q is a factor of the leading coefficient.
For the given case,
the constant term is -1 and the leading coefficient is 1.
Hence, any rational root of the equation should be of the form p/q
Here, p is a factor of -1 and q is a factor of 1.
The possible rational roots are ±1 and ±1/3.
Applying the principle of testing these values, we evaluate that
x = -1/3 is a root of the equation.
Then, we can factorize
x³ + 3x² - 1 as (x + 1/3)(x² + 2x - 3).
The quadratic factor can be simplified further as
(x + 3)(x - 1),
Then, the solutions to the original equation are
x = -4/3, x = -3, and x = 1.
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The average cost per month of owning an iPhone decreases as the number of months of ownership increases. After 8 months, the average cost per month is $145.

Assuming a constant monthly service fee of $70, the total cost (C) of owning an iPhone for n months can be calculated as:

C = 600 + 70n

where n is the number of months of ownership.

Using this formula, we can calculate the total cost of owning an iPhone after:

i. 2 months:

C = 600 + 70(2) = 740

ii. 4 months:

C = 600 + 70(4) = 880

iii. 6 months:

C = 600 + 70(6) = 1020

iv. 8 months:

C = 600 + 70(8) = 1160

To find the average cost per month, we can divide the total cost by the number of months:

i. Average cost per month after 2 months: 740 / 2 = 370

ii. Average cost per month after 4 months: 880 / 4 = 220

iii. Average cost per month after 6 months: 1020 / 6 = 170

iv. Average cost per month after 8 months: 1160 / 8 = 145

Therefore, the average cost per month of owning an iPhone decreases as the number of months of ownership increases. After 8 months, the average cost per month is $145.

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