May I please get some help

Let R(x), C(x), and P(x) be, respectively, the revenue, cost, and profit, in dollars, from the production and sale of x items. If R(x) = 4x and C(x) =0.004x + 1.6x +60, find each of the following. a) P(x) b) R(100). C(100), and P(100) c) R'(x). C'(x). and P'(x) d) R'(100), C'(100), and P'(100) a) P(x) = (Use integers or decimals for any numbers in the expression.)