Question

The water usage at a car wash is modeled by the equation W(x) = 4x3 + 6x2 − 11x + 7, where W is the amount of water in cubic feet and x is the number of hours the car wash is open. The owners of the car wash want to cut back their water usage during a drought and decide to close the car wash early two days a week. The amount of decrease in water used is modeled by D(x) = x3 + 2x2 + 15, where D is the amount of water in cubic feet and x is time in hours.

Write a function, C(x), to model the water used by the car wash on a shorter day.

Answer 1

the second option

Explanation:

Answer 2

C(x)=3x³+4x²-11x-8

Explanation:

The water usage is modeled by the equation W(x) = 4x³ + 6x² − 11x + 7

The amount of decrease in water used is modeled by D(x) = x³ + 2x² + 15

C(x)= W(x)-D(x)

C(x)=4x³ + 6x² − 11x + 7-(x³ + 2x² + 15)

C(x)=4x³ + 6x² − 11x + 7-x³-2x²-15

c(x)=3x³+4x²-11x-8