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arlik [135]
3 years ago
13

Rachael's backyard swimming pool is being emptied by a pump. The amount of water in the pool (W, measured in gallons) at any tim

e (t, measured in hours) is given by the following equation:
W = -250t + 9000

a. How many gallons of water are being pumped out each hour? Explain.

b. After 11 hours, how much water is left in the pool? Explain.

c. How much water was in the pool at the start? Explain.

d. How long will it take the pool to empty? Explain.
Mathematics
1 answer:
trapecia [35]3 years ago
6 0
A 250 1 times 250 substract by 9000 gives 8750 them find loss of water by 9000 substracted by 8750
b 6250 11 times 250 substract by 9000 gives 6250.
c 9000 t=0 since no water it's being pumped out so answer is 9000
d 36 hours times 250 is 9000
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Answer:

y = 1/12 (x − 5)²

Step-by-step explanation:

We can solve this graphically without doing calculations.

The y component of the focus is y = 3.  Since this is above the directrix, we know this is an upward facing parabola, so it must have a positive coefficient.  That narrows the possible answers to A and C.

The x component of the focus is x = 5.  Since this is above the vertex, we know the x component of the vertex is also x = 5.

So the answer is A. y = 1/12 (x−5)².

But let's say this wasn't a multiple choice question and we needed to do calculations.  The equation of a parabola is:

y = 1/(4p) (x − h)² + k

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The vertex is halfway between the focus and the directrix.  So p is half the difference of the y components:

p = (3 − (-3)) / 2

p = 3

k, the y component of the vertex, is the average:

k = (3 + (-3)) / 2

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h = 5

So:

y = 1/(4×3) (x − 5)² + 0

y = 1/12 (x − 5)²

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2 years ago
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