Select all the correct answers. maya and her friends are planning a car wash event. maya creates a function c(x) to model the group's costs for washing x cars and a function r(x) to model the revenue the group will make from washing x cars. the net profit the group will earn is represented by the function p(x) = -60 + 4.5x, which is equal to r(x) - c(x). select the two functions that could represent the cost and revenue for the car wash. a. r(x) = 10x b. r(x) = 7x c. c(x) = 11.5x - 60 d. c(x) = 4.5x + 60 e. r(x) = 8x f. c(x) = 3.5x + 60