2. The demand function for q units of a certain product is given by the equation p, where p is in dollars. p = 50 - 5 In(q + 10) Suppose that the cost function in dollars for q units of this product is C(q) = 21q + 3 a. Find the marginal revenue function. (Recall: Revenue = price x quantity)b. Use calculus to approximate the revenue from the sale of 9'\" unit. :2. Find the marginal profit function. (Recall: Profit = Revenue - Cost} d. Use CEIICUIUS to approximate the prot from one more unit when 3 units are sold. 3. For the function f(x) = 4x3 9x2 - 30.1: + E: 3. Find the critical numbers. in. Find the open intervals where the function is increasing. c. Find the open intervals where the function is decreasing. MATH 1325 Page 2 of 4