PLEASE NEED HELP. THANKS

The cost, in dollars, for a company to produce x widgets is given by C(x) = 5000 + 3.00x for x 0, and the price-demand function, in dollars per widget, is p(x) = 28 - 0.02x for 0x 1400.

(a) Find and interpret C(800).

(b) Find and interpret (800). (Note that (x) is the average cost function.)

(c) Find and simplify the expression for the revenue function R(x).

(d) Find and simplify the expression for the profit function P(x).

(e) Find and interpret P(800), where P(x) is the profit function in part (d).