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) =7x and C(x) =0.003x + 2.6x + 40, 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.)