The price p (in dollars) and the demand x for a particular clock radio are related by the equation x = 4000 - 10p. (A) Express the price p in terms of the demand x, and find the domain of this function. (B) Find the revenue R(x) from the sale of x clock radios. What is the domain of R? (C) Find the marginal revenue at a production level of 2800 clock radios. (D) Interpret R'(3500) = - 300.00. . . . (A) p= p(x) =[