Question

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

Answer 1

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