Given a cost function C = 45Q + 3Q²: (a) What is the average cost function? What is average fixed cost? What is average variable cost? = (b) What is the average cost, average fixed cost, and average variable cost at Q = 10? At Q = 15? (c) What is the marginal cost function? (d) What is the marginal cost at Q = 10? At Q = 15? (e) A firm breaks even if the average cost is equal to the price it charges. If the price is $60, then how many units must the firm sell in order to break even?