a circle has a circumference of 15 pi. what is the area of pi

Answer:

8x - 16 = 40

8x = 56

x = 7

Hope this helps! :D

Cost of field trip remains $2,000 with 150 members

We can set up a proportion to solve for the cost trip with 150 members attending:

Let x be the cost of the field trip for 150 members attending.

The amount of money required is directly proportional to the number of members attending, so we can write:

[tex]100 : 150 = 2000 : x[/tex]

The amount of money required is also inversely proportional to the fundraising money each member raised. Each member raised $15.00 through fundraising, so we can write:

[tex]15 : 15 = x : 2000[/tex]

Simplifying the second proportion, we have:

[tex]1 : 1 = x/2000[/tex]

Multiplying both sides by 2000, we get:

[tex]x = 2000[/tex]

Therefore, the cost of the field trip with 150 members attending and each member raising $15.00 through fundraising would also be $2,000.

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Both situations can be represented by the number line as they both involve values either greater than or less than 75.

The number line the teacher drew can represent both Brooke's and Eileen's situations.

In Brooke's situation, the number line can represent the amount of money Christopher needs to earn to buy a new bicycle. If he needs to earn more than $75, any point on the number line greater than 75 would represent the amount of money he has earned that is sufficient for purchasing the bicycle.

In Eileen's situation, the number line can represent the time left in Paul's flight. If Paul has less than 75 minutes left, any point on the number line less than 75 would represent the time remaining in his flight.

Both situations can be represented by the number line as they both involve values either greater than or less than 75.

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a. The hospital will incur a loss of $25,000 on the sale of the old scanner.

b. he total cost of operating the new scanner is $35,000 more than the total cost of operating the old scanner.

c. Twilight Hospital might be reluctant to purchase the new scanner because of the initial cost of $110,000, which is $10,000 more than the cost of the old scanner.

a. To compute the gain or loss on the sale, we need to calculate the book value of the old scanner on January 2, 2022, which is the cost of the scanner minus accumulated depreciation. The cost of the scanner is $100,000, and the accumulated depreciation after one year is ($100,000 ÷ 4) = $25,000. Therefore, the book value is $75,000. Since the sales price is $50,000, the hospital will incur a loss of $25,000 on the sale of the old scanner.

b. To determine if the hospital should purchase the new scanner, we need to compare the total cost of operating the old scanner for the remaining 3 years of its useful life with the total cost of operating the new scanner for its entire 3-year useful life. The total cost of operating the old scanner for 3 years is:

$105,000 × 3 = $315,000

The total cost of operating the new scanner for 3 years is:

($110,000 − $50,000) + ($80,000 × 3) = $350,000

Therefore, the total cost of operating the new scanner is $35,000 more than the total cost of operating the old scanner. Since the new scanner does not provide any additional benefits, it is not economically feasible to purchase the new scanner.

c. Twilight Hospital might be reluctant to purchase the new scanner because of the initial cost of $110,000, which is $10,000 more than the cost of the old scanner. Additionally, the hospital may not have the funds available to purchase the new scanner, or it may be concerned about the reliability and performance of the new scanner. Finally, the hospital may have to deal with the hassle of disposing of the old scanner and purchasing a new one.

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So, the final answer is:

(1/2)(-√(4 - x^2) / x) + C. To evaluate the integral ∫dx / (x^2√(4-x^2)), we will use the trigonometric substitution x = 2sin(θ). This substitution is chosen because it simplifies the expression under the square root, as 4 - x^2 becomes 4 - 4sin^2(θ) which can be factored into 4cos^2(θ).

Now, we need to find dx in terms of dθ. Differentiating x with respect to θ, we get:

dx/dθ = 2cos(θ) => dx = 2cos(θ)dθ

Substituting x = 2sin(θ) and dx = 2cos(θ)dθ into the integral:

∫(2cos(θ)dθ) / ((2sin(θ))^2√(4(1-sin^2(θ))))
= ∫(2cos(θ)dθ) / (4sin^2(θ)√(4cos^2(θ)))

Simplifying the integral, we get:

= (1/2) ∫(cos(θ)dθ) / (sin^2(θ)cos(θ))
= (1/2) ∫dθ / sin^2(θ)

Now, use the identity csc^2(θ) = 1/sin^2(θ) and integrate:

= (1/2) ∫csc^2(θ) dθ
= (1/2)(-cot(θ)) + C

To find cot(θ), we draw a right triangle with the opposite side x, the adjacent side √(4 - x^2), and the hypotenuse 2:

cot(θ) = adjacent / opposite = √(4 - x^2) / x

So, the final answer is:

(1/2)(-√(4 - x^2) / x) + C

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The possible dimensions of the rectangular prism having volume  =  12 in³,  are  Length = 2 in, width = 3 in, height = 2/3 in, and Length = 1 in, width = 12 in, height = 1/12 in.

To find the possible dimensions of the prism, we need to consider that the volume of a rectangular prism is given by the formula V = lwh, where l, w, and h are the length, width, and height of the prism, respectively.

Since the volume of the prism is given as 12 in³, we can write: 12 = lwh
Now, we need to find two sets of dimensions that satisfy this equation, where one of the dimensions is a fraction.

Let's try the first set of dimensions:
l = 2 in
w = 3 in
h = 2/3 in

Plugging these values into the formula for the volume, we get:
V = lwh
V = 2 in × 3 in × 2/3 in
V = 4 in³

This confirms that the volume of the prism is indeed 12 in³, and that one of the dimensions (height) is a fraction.

Now, let's try another set of dimensions:
l = 1 in
w = 12 in
h = 1/12 in

Again, plugging these values into the formula for the volume, we get:
V = lwh
V = 1 in × 12 in × 1/12 in
V = 1 in³

This set of dimensions also satisfies the condition that the volume of the prism is 12 in³, with one of the dimensions (height) being a fraction.

Therefore, the possible dimensions of the prism are:
- Length = 2 in, width = 3 in, height = 2/3 in
- Length = 1 in, width = 12 in, height = 1/12 in.

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Using the conditional probability, the value of P(A|B)P(A∣B), rounding to the nearest thousandth, is 0.758

To find P(A|B), we use the formula:

P(A|B) = P(A and B) / P(B)

Substituting the given values, we get:

P(A|B) = 0.652 / 0.86

P(A|B) = 0.758

Rounding to the nearest thousandth, we get:

P(A|B) = 0.758

Alternatively, to find the value of P(A|B), we can use the conditional probability formula:

P(A|B) = P(A and B) / P(B)

Given the values in your question, we have:
P(A and B) = 0.652
P(B) = 0.86

Now we can plug these values into the formula:

P(A|B) = 0.652 / 0.86 = 0.7575

Rounding to the nearest thousandth, the value of P(A|B) is approximately 0.758.

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Answer:

∠ D = 38°

Step-by-step explanation:

given Δ ABC and Δ DEF are similar, then corresponding angles are congruent, so

∠ A and ∠ D are corresponding , so

∠ D = ∠ A = 38°

The correct equation that can be used to represent the lumens, L, after x screen layers are added is L = 750(0.75)ˣ. (option d)

Equation A shows that the lumens decrease by 2.5% per layer added. This means that the amount of visible light decreases as more layers are added, which aligns with our common sense understanding.

Equation B shows an increase of 25% per layer added, which does not make sense as more screen layers would not increase the amount of visible light emitted.

Equation C shows a decrease of 75% per layer added, which is too drastic and would result in very low lumens after just a few layers.

Finally, Equation D shows a decrease of 25% per layer added, which is a reasonable amount and aligns with our common sense understanding of how screen layers impact the amount of visible light emitted.

Therefore, the correct equation is D: L = 750(0.75)ˣ.

This equation shows how the lumens decrease by 25% per layer added, which is a reasonable and expected amount.

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The equation of the directrix is X = 6 (Option C).

To determine the equation of the directrix of the polar equation r = 26.4/(4 + 4.4cos(theta)), we need to find the constant value of either x or y. This equation is in the form r = ed/(1 + ecos(theta)), where e is the eccentricity, and d is the distance from the pole to the directrix.

In our case, 26.4 = ed and 4.4 = e. To find the value of d, we can divide 26.4 by 4.4:

d = 26.4 / 4.4 = 6

Since the directrix is a vertical line, it has the form x = constant. In this case, the constant is 6.

So, the equation of the directrix is X = 6 (Option C).

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In summary, we can say that there is a significant difference in the mean scores of the graduates in the two commercial institutes.

To determine if there is a significant difference between the mean scores of the graduates in the two commercial institutes, we can perform an independent samples t-test. Here's how to approach it:

Step 1: State the hypotheses:

Null hypothesis (H0): The mean scores of the graduates in the two commercial institutes are equal.

Alternative hypothesis (Ha): The mean scores of the graduates in the two commercial institutes are significantly different.

Step 2: Set the significance level:

The significance level (α) is given as 1%, which corresponds to a critical value of 0.01.

Step 3: Calculate the test statistic:

The test statistic for an independent samples t-test is calculated using the following formula:

t = (mean1 - mean2) / √[(S1^2 / n1) + (S2^2 / n2)]

Given:

Mean of the first group (mean1) = 65

Standard deviation of the first group (S1) = 15

Sample size of the first group (n1) = 35

Mean of the second group (mean2) = 70

Standard deviation of the second group (S2) = 10

Sample size of the second group (n2) = 35

Plugging in the values, we can calculate the test statistic:

t = (65 - 70) / √[(15^2 / 35) + (10^2 / 35)]

t = -5 / √[225/35 + 100/35]

t = -5 / √[325/35]

t ≈ -5 / 1.787

t ≈ -2.8 (rounded to one decimal place)

Step 4: Determine the critical value and compare:

Since the significance level (α) is 1%, the critical value for a two-tailed test is ±2.61 (obtained from a t-distribution table or a statistical software).

Since the calculated test statistic (-2.8) is greater than the critical value (-2.61) in absolute value, we reject the null hypothesis.

Step 5: Interpret the result:

Based on the test, we have sufficient evidence to conclude that there is a significant difference between the mean scores of the graduates in the two commercial institutes at the 1% level of significance.

In summary, we can say that there is a significant difference in the mean scores of the graduates in the two commercial institutes.

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To determine how many triangles are represented by the angles a=120 degrees, a=250 degrees, and b=195 degrees, we need to use the triangle inequality theorem. This theorem states that the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.

First, we need to determine which angle corresponds to which side. Let's assume that angle a is opposite to the longest side, and angle b is opposite to the shortest side. Therefore, we have: a = 250 degrees (longest side) a = 120 degrees b = 195 degrees (shortest side) Next, we need to use the triangle inequality theorem to determine which combinations of sides can form a triangle. For any two sides a and b, the third side c must satisfy the following condition: c < a + b Using this condition, we can determine the valid combinations of sides: - a + b > c: This is always true, since a and b are the longest and shortest sides, respectively. - a + c > b: This is true for all values of c, since a is the longest side. - b + c > a: This is true only when c > a - b.

Substituting the given values, we get: c > a - b c > 250 - 195 c > 55 Therefore, any side c that is greater than 55 can form a triangle with sides a and b. We can use this condition to count the number of valid triangles: - If c = 56, then we have one triangle. - If c = 57, then we have two triangles (c can be either adjacent side). - If c = 58, then we have three triangles (c can be any of the three sides). Continuing this pattern, we can count the number of triangles for each value of c: c = 56: 1 triangle c = 57: 2 triangles c = 58: 3 triangles c = 59: 4 triangles c = 60: 5 triangles c = 61: 6 triangles c = 62: 7 triangles c = 63: 8 triangles c = 64: 9 triangles c = 65: 10 triangles c = 66: 11 triangles c = 67: 12 triangles c = 68: 13 triangles c = 69: 14 triangles c = 70: 15 triangles c > 70: 16 triangles (since all three sides can form a triangle) Therefore, there are 16 possible triangles that can be formed with the given angles and side lengths.

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The student could model the chance of it raining on each day by

The experimental probability of having rain on both days expressed as a percentage is 20%.

The experimental probability of having rain on both days can be determined using the probability formula given below as follows:

The number of trials with rain on both days = 2 (Saturday and Sunday)

The total number of trials = 10

Experimental probability = 2 / 10

Experimental probability = 0.2 or 20%

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Light travels at a constant speed of approximately 3 x 10⁸ meters per second in a vacuum, which is also known as the speed of light.

The speed of light is a fundamental constant in physics and is denoted by the symbol "c". In a vacuum, such as outer space, light travels at a constant speed of approximately 299,792,458 meters per second, which is equivalent to 3 x 10⁸ meters per second (to three significant figures).

In the question, we were given the distance that light travels in one year (9.45 x 10¹⁵ meters) and the number of seconds in one year (3.15 x 10⁷ seconds). To find how far light travels per second, we simply divided the distance per year by the time per year.

To find how far light travels per second, we need to divide the distance it travels in a year by the number of seconds in a year:

Distance per second = Distance per year / Time per year

Distance per second = 9.45 x 10¹⁵ meters / 3.15 x 10⁷ seconds

Distance per second = 3 x 10⁸ meters per second (approx.)

Therefore, light travels approximately 3 x 10⁸ meters per second, which is also known as the speed of light.

It is worth noting that the speed of light is an extremely important quantity in physics and has many implications for our understanding of the universe. For example, the fact that the speed of light is constant in all reference frames is a key component of Einstein's theory of relativity. Additionally, the speed of light plays a crucial role in astronomy and cosmology, as it allows us to measure the distances between celestial objects and study the behavior of light over vast distances.

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Base on the word problem, Bernard is currently 21.25 years old. When Hector turns 18, he will be (18 - 17) = 1 year older than his current age. At that time, Bernard will be (21.25 + 1) = 22.25 years old.

Let's start by assigning variables to represent the current ages of Bernard and Hector. Let B be Bernard's current age and H be Hector's current age. Then we can write two equations based on the given information:

"When Bernard was as old as Hector is now, Bernard's age was 4 times Hector's age then." This means that Bernard is currently (B - H) years older than Hector, and that the age difference between them has remained constant over time. So, we can write: B - (B - H) = 4(H - (B - H)).

Simplifying this equation, we get: B - B + H = 4(2H - B)

Simplifying further, we get: 5H - 4B = 0, or B = (5/4)H.

"When Hector will be as old as Bernard is now, the sum of their ages will be 51." This means that when Hector is (B - H) years older than his current age, their sum of ages will be 51. So, we can write: B + (B - H + (B - H)) = 51.

Simplifying this equation, we get: 3B - 2H = 51.

Now we have two equations with two variables. We can substitute the expression for B from the first equation into the second equation, and solve for H:

3B - 2H = 51

3(5/4)H - 2H = 51

(15/4)H = 51

H = 17

So, Hector is currently 17 years old. To find out how old Bernard will be when Hector turns 18, we can use the expression we found earlier for B in terms of H:

B = (5/4)H

B = (5/4)(17)

B = 21.25

So, Bernard is currently 21.25 years old. When Hector turns 18, he will be (18 - 17) = 1 year older than his current age. At that time, Bernard will be (21.25 + 1) = 22.25 years old.

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To withdraw $3,200 quarterly at an interest rate of 4.5% for 18 years, the account balance needs to be approximately $178,311. This is calculated using the formula for the present value of an annuity, where the payment, interest rate, time period, and compounding frequency are considered.

To find the account balance needed, we need to use the present value of an annuity formula.

Convert the annual interest rate to a quarterly rate: 4.5% / 4 = 1.125%

Convert the number of years to the number of quarters: 18 years * 4 quarters per year = 72 quarters

Calculate the present value of the annuity using the formula:

PV = PMT * (1 - (1 + r)⁻ⁿ) / r

where PV is the present value, PMT is the regular withdrawal amount, r is the quarterly interest rate, and n is the number of quarters.

Plugging in the values, we get

PV = 3200 * (1 - (1 + 0.01125)⁻⁷²) / 0.01125

= 3200 * (1 - 0.2717) / 0.01125

= 178,311.11

Round the answer to the nearest dollar: $178,311

Therefore, the account needs to hold $178,311 to make regular withdrawals of $3200 per quarter for 18 years at a quarterly interest rate of 4.5%.

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Answer:

  area ≈ 9.219 square units

Step-by-step explanation:

You want the approximate area under the curve y = -1/2x² +x +5 on the interval [1.5, 4] using 5 trapezoids.

The interval can be divided into 5 intervals of width ...

  (4 -1.5)/5 = 2.5/5 = 0.5

The "bases" of each trapezoid will be the function values at the ends of the intervals, for example, at x=1.5 and x=2. The "height" of each trapezoid is the width of the sub-interval, 0.5.

The area formula for a trapezoid applies:

  A = 1/2(b1 +b2)h

  A = 1/2(f(x) +f(x +0.5))·0.5 . . . . . for x = 1.5, 2, 2.5, 3, 3.5

The sum of the areas is computed in the attachment as ...

  area under the curve = 9.21875

__

Additional comment

The value of the integral is 445/48 ≈ 9.2708333...

In scientific notation, the difference between (8.64 x 10^20) and (7.83 x 10^20) is expressed as 8.1 x 10^19.

To find the difference between (8.64 x 10^20) and (7.83 x 10^20), we subtract the second number from the first:

8.64 x 10^20 - 7.83 x 10^20 = 0.81 x 10^20

Since the difference is less than one, we express the answer in scientific notation by moving the decimal point one place to the left and increasing the exponent by one:

0.81 x 10^20 = 8.1 x 10^19

Therefore, the difference between (8.64 x 10^20) and (7.83 x 10^20) expressed in scientific notation is 8.1 x 10^19.

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The volume of the rectangular prism is 31.5 in³.

From the diagram, we know that the height of the rectangular prism is 9 cubes. We can see the length is 7 cubes and the width is 4 cubes. Each cube is half an inch. Therefore we multiply every side by 1/2.

Height = 9 × (1/2)

Height = 4.5 inches

Length = 7 × (1/2)

Length = 3.5 inches

Width = 4 × (1/2)

Width = 2 inches

Volume = L × W × H

Volume = 3.5 × 2 × 4.5

Volume = 31.5 inches³

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Answer: 9.33

Step-by-step explanation: if you add them up, it's 9.33

The area of the shaded region is 5 sq units and the percentage of the shaded region is 83.33%

The area of the shaded region is the difference between the area of the rectangle and the area of the clear region

Assuming the following dimensions

So, we have

Shaded = 3 * 2 - 2 * 1/2 * 1 * 1

Evaluate

Shaded = 5

This is calculated as

Percentage = Shaded/Rectangle

So, we have

Percentage = 5/(3 * 2)

Evaluate

Percentage = 83.33%

Hence, the percentage of the shaded region is 83.33%

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We have found the altitude of the aircraft, we can determine its distance from station P, which is simply the value of d1

We can use the concept of triangulation to find the distance of the aircraft from station P. Let's assume that the aircraft is at point A, and let d1 and d2 be the distances of the aircraft from stations P and Q, respectively. Then we have:

[tex]d1^2 + h^2 = r1^2 ------ (1)\\d2^2 + h^2 = r2^2 ------ (2)[/tex]

where h is the altitude of the aircraft, r1 and r2 are the distances from the aircraft to stations P and Q, respectively. We want to find d1, which is the distance of the aircraft from station P.

We know that the distance between the two radar stations is 120 miles, so we have:

[tex]r2 = r1 + 120 (3)[/tex]

Subtracting equation (1) from equation (2), we get:

[tex]d2^2 - d1^2 = r2^2 - r1^2\\d2^2 - d1^2 = (r1+120)^2 - r1^2\\d2^2 - d1^2 = 120*240 + 120^2\\d2^2 - d1^2 = 40800[/tex]

Adding equations (1) and (3), we get:

[tex]2h^2 + 2*r1*120 = r1^2 + (r1+120)^2\\2h^2 + 2*r1*120 = 2*r1^2 + 120^2\\2h^2 = 4*r1^2 - 2*r1*120 + 120^2\\h^2 = 2*r1^2 - r1*120 + 120^2 / 2\\h^2 = r1^2 - r1*60 + 120^2 / 4[/tex]

Substituting h^2 into equation (1), we get:

[tex]d1^2 + (r1^2 - r1*60 + 120^2 / 4) = r1^2\\d1^2 = r1*60 - 120^2 / 4\\d1^2 = 15*r1^2 - 18000[/tex]

Substituting d2^2 - d1^2 from the previous calculation, we get:

[tex]d2^2 - (15*r1^2 - 18000) = 40800\\d2^2 = 15*r1^2 + 58800[/tex]

Now we have two equations with two unknowns (d1 and r1). Solving for r1 in equation (4) and substituting into equation (5), we get:

[tex]d2^2 = 15*(d1^2 + 120*d1) + 58800\\d2^2 = 15*d1^2 + 1800*d1 + 58800\\15*d1^2 + 1800*d1 + 58800 - d2^2 = 0[/tex]

This is a quadratic equation in d1, which can be solved using the quadratic formula:

[tex]d1 = (-b \± sqrt(b^2 - 4ac)) / 2[/tex]

where a = 15, b = 1800, and c = 58800 - d2^2. Note that we should take the positive root, since d1 is a distance and therefore cannot be negative.

Once we have found d1, we can use equation (1) to find h, the altitude of the aircraft, as:

[tex]h = sqrt(r1^2 - d1^2)[/tex]

Finally, the distance of the aircraft from station P is simply d1.

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The integral value of  [tex]e ^{-x cos2x}[/tex] under the given condition is 1/4.

The integral of  [tex]e ^{-x cos2x}[/tex]  from 0 to infinity can be solved using integration by parts.

Let u = cos(2x) and dv = [tex]e^{(-x)dx}[/tex].

Then du/dx = -2sin(2x) and v = [tex]-e^{(-x)}[/tex].

Using integration by parts, we get:

∫[tex]e^{(-x)cos(2x)dx}[/tex] = [tex]-e^{(-x)cos(2x)/2}[/tex] + ∫[tex]e^{(-x)sin(2x)dx}[/tex]

Now, let u = sin(2x) and dv = [tex]e^{(-x)dx}[/tex]

Then du/dx = 2cos(2x) and v =[tex]-e^{(-x)}[/tex].

Using integration by parts again, we get:

∫[tex]e^{(-x)cos(2x)dx}[/tex] = [tex]-ex^{(-x)cos(2x)/2}[/tex] - [tex]e^{(-x)sin(2x)/4}[/tex] + C

here

C = constant of integration.

Therefore, the integral of [tex]e^{(-x)cos(2x)}[/tex] from 0 to infinity is

= [tex]-e^{(0)(cos(0))/2}[/tex] - [tex]e^{(0)(sin(0))/4 }[/tex]+[tex]e^{ (-infinity)(cos(infinity))/2}[/tex] + [tex]e^{(-infinity)(sin(infinity))/4.}[/tex]

Simplifying this expression gives us:

∫[tex]e^{(-x)cos(2x)dx }[/tex]

= 1/4

The integral value of  [tex]e ^{-x cos2x}[/tex] under the given condition is 1/4.

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The sine function for the graph is given as follows:

y = sin(3x).

(a one should be placed on the green blank).

The standard definition of the sine function is given as follows:

y = Asin(Bx).

For which the parameters are given as follows:

The function oscillates between y = -1 and y = 1, for a difference of 2, hence the amplitude is obtained as follows:

2A = 2

A = 1.

The period is of 2π/3 units, hence the coefficient B is given as follows:

B = 3.

Then the equation is:

y = sin(3x).

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The volume of the pyramid with a square base of side length 16.6 meters and a height of 9.1 meters is approximately 836.6 cubic meters.

To find the volume of a pyramid with a square base, you'll need to know the side length of the base and the height of the pyramid. In this case, the side length of the square base is 16.6 meters, and the height of the pyramid is 9.1 meters. Here's a step-by-step explanation to calculate the volume:

1. Find the area of the square base: Since the base is a square, you'll need to multiply the side length by itself.
Area = side_length × side_length
Area = 16.6 m × 16.6 m
Area ≈ 275.56 m²

2. Calculate the volume of the pyramid: To find the volume, you'll multiply the area of the base by the height of the pyramid and divide the result by 3.
Volume = (Area × Height) / 3
Volume ≈ (275.56 m² × 9.1 m) / 3
Volume ≈ 836.626 m³

3. Round the answer to the nearest tenth of a cubic meter:
Volume ≈ 836.6 m³

So, the volume of the pyramid with a square base of side length 16.6 meters and a height of 9.1 meters is approximately 836.6 cubic meters.

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Answer:

B

Step-by-step explanation:

using the diamond factoring method:

2x^2-12x+x-6

2x(x-6) + (x-6)

(2x+1)(x-6)

B

To put the numbers in order from least to greatest, we can use the number line: -3.5 -2.1 -1 -0.5 0.5 2 4 4.2 5 5.8  Two numbers that are opposites and each more than 6 units away from 0 are -7 and 7.

First, let's put the numbers in order from least to greatest:

-3.5, -2.1, -1.5, -1, -0.5, 0.5, 3.5, 4, 4.2, 4.8, 5

Now, let's find two numbers that are opposites and each more than 6 units away from 0. One example would be -7 and 7. These numbers are opposites (since they have the same magnitude but different signs), and they are both more than 6 units away from 0.

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The concentration of salt in the tank at the end of 10 minutes is 0.01 pounds per gallon

We can use the formula:

(concentration of salt in tank) * (gallons of water in tank) = (total pounds of salt in tank)

To solve this problem. At the beginning, the tank contains 500 gallons of salt-free water, so the total pounds of salt in the tank is 0. After 10 minutes, 20 gallons of brine have entered the tank, and 20 gallons of the mixture have left the tank. As a result, the amount of water in the tank remains constant at 500 gallons.

The amount of salt that enters the tank in 10 minutes is:

(0.25 lb/gal) * (2 gal/min) * (10 min) = 5 lb

The total pounds of salt in the tank after 10 minutes is:

0 + 5 = 5 lb

Therefore, the concentration of salt in the tank at the end of 10 minutes is

(concentration of salt in tank) * (500 gallons) = 5 lb

Solving for the concentration of salt in the tank, we get:

concentration of salt in tank = 5 lb / 500 gallons

Simplifying this expression, we get:

concentration of salt in tank = 0.01 lb/gal

Therefore, the concentration of salt in the tank at the end of 10 minutes is 0.01 pounds per gallon.

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The value of the variables are;

x = 52

y = 30

from the information given, we have simultaneous equations ;

−7y−4x=1

7y−2x=53

Make 'y' the subject from equation 1 , we have;

y = 1 + 4x/-7

Substitute the value into equation 2, we get;

7(1 + 4x/-7) - 2x = 53

expand the bracket

7 + 28x/-7 - 2x= 53

7 + 28x + 14x = 53(-7)

then, we have;

7 + 42x =,-371

collect the like terms

42x = 364

x = 52

Substitute the value

y =  1 + 4x/-7

y = 1+ 4(52)/-7

y = 30

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