Consider the following problem: The total expected revenue from selling tickets for a certain concert as a function of a single ticket's price, x, changes at a rate of r (x) = 17 - 0.24x thousands of dollars per dollar. When a = 70, the total expected revenue is 128 thousand dollars. What is the total expected revenue when the ticket price is $80 ? Which expression can we use to solve the problem? Choose 1 answer: A r'(80) B r'(80) - r' (70) 80 C r(x) da 80 D 128 + r(x) dx 70