Let R(x), C(x), and P(x) be, respectively, the revenue, cost, and prot, in dollars, from the production and sale of x items. If R(x) = 8x and C(x) = 0.004x2 + 5.6x + 40, nd each of the following. a) PM b) R(150), C(150), and P(150) c) R'(x), C'(x), and P'(x) d) R'(150), C'(150), and P'(150) a) P(x) = D (Use integers or decimals for any numbers in the expression.)