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 + 900. How long will it take the pool to empty? Explain.

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

the answer is b.

step-by-step explanation:

3

step-by-step explanation: