please help with questions 8 and 9

.Question 8 0/1 pt @ Details The price p (in dollars) and the demand a for a certain digital clock radio is given by the price-demand function p = 10 - 0.001x a. Find the revenue function R (2). R(x) = b. Find the marginal revenue function. R'(a) : c. Find the marginal revenue at x = 1000 and x = 9000. R'(1000) = R' (9000) = Question Help: B VIDEO B Written Example Message instructor D Post to forum .Question 9 C0/1 pt @ Details The cost function, in dollars, of a company that manufactures food processors is given by C(x) = 150 +- + . where x is the number of food processors manufactured. a. Find the marginal cost function. C'(x) = b. Find the marginal cost of manufacturing 10 food processors. Round to the nearest cent. C'(10) =$ c. Find the actual cost of manufacturing the eleventh food processor. Round to the nearest cent. LA Question Help: B VIDEO Message instructor D Post to forum