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3 years ago

Find the volume of the region bounded by z=x2, 0≤x≤2, and the planes y=0, y=7, and z=0.

Mathematics

1 answer:

algol133 years ago

5 0

Im sorry, i dont know

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Can you plz help me with this math problem?

Sedaia [141]

Answer:

Step-by-step explanation:

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3 years ago

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Help pls the first questions option is<br> 25,40,75<br> And the next option is <br> 40,75,140

Pachacha [2.7K]

Answer:

C is 40 and D is 75

Step-by-step explanation:

look at the angle

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3 years ago

Karl bought 3 1/2 gallons of milk that cost $2.70 per gallon. What was the total cost of the milk? Enter your answer in the

pav-90 [236]

Answer:

9.45

Step-by-step explanation:

2.70*3 = 8.10

8.10 + 1.35= 9.45

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3 years ago

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A washer and a dryer cost $572 combined. The washer cost $78 less than the dryer. What is the cost of the dryer?

Anni [7]

Answer:

$325

Step-by-step explanation:

Let the dryer price be x, then the washer price would be x-78

x+x-78 = 572

2x = 650

x = 325

4 0

2 years ago

2. Carl needs 15 hours longer than Jennifer to paint a room. If they work together, they can complete the job in 4 hours. Explai

nasty-shy [4]

Answer:

Jennifer would complete the job on her own in 5 hours.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

$ax^{2} + bx + c, a\neq0$ .

This polynomial has roots $x_{1}, x_{2}$ such that $ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})$ , given by the following formulas:

$x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}$

$x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}$

$\Delta = b^{2} - 4ac$

Rates

The together rate is the sum of their separates rate.

We have that:

Jennifer takes x hours to complete the job on her own, so her rate is 1/x.

Carl needs 15 hours longer than Jennifer, that is, 15 + x hours, so his rate is 1/(15+x).

The together rate is 1/4. So

$\frac{1}{4} = \frac{1}{x} + \frac{1}{15+x}$

$\frac{1}{4} = \frac{15 + x + x}{x(15+x)}$

$\frac{1}{4} = \frac{15 + 2x}{x(15+x)}$

Applying cross multiplication.

$x^2 + 15x = 4(15 + 2x)$

$x^2 + 15x = 60 + 8x$

$x^2 + 7x - 60 = 0$

Quadratic equation with $a = 1, b = 7, c = -60$ . So

$\Delta = 7^{2} - 4*1*60 = 289$

$x_{1} = \frac{-7 + \sqrt{289}}{2} = 5$

$x_{2} = \frac{-7 - \sqrt{289}}{2} = -12$

Since the time to complete the job has to be a positive value.

Jennifer would complete the job on her own in 5 hours.

4 0

2 years ago