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the water usage at a car wash is modeled by the equation w(x) = 5x3 + 9x2 − 14x + 9, 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.
c(x) = 5x3 + 7x2 − 14x − 6
c(x) = 4x3 + 7x2 − 14x + 6
c(x) = 4x3 + 7x2 − 14x − 6
c(x) = 5x3 + 7x2 − 14x + 6