Find and simplify each of the following for f(x) = 6x- - 6x +5. (A) f(x + h) (B) f(x + h) - f(x) f(x + h) - f(x) (C) h (A) f(x + h) = (Do not factor.)Use the revenue and cost functions below, to answer parts (A), (B), and (C). R(x) = 80x - 3x2 1 5 x$ 20 C(x) = 120 + 16x 1 5x$ 20 (A) What is the profit function? P(x) =