Graphs of the cost C(x), revenue R(x) and the profit P(x), in thousands of dollars, are shown, where x is the number thousands of dollars of thousands of items produced. 840- 780- (a) Use the graph to find the formula for the revenue R(x). 720 R (b) The profit is given by P(x) = - x" + 21x" -99x - 2. What is the formula for the cost function C(x)? 660 (c) Report the fixed costs. 600- (d) Report the minimum marginal cost. 540- (e) What is the largest profit possible? 480- 420- 360 300- 240- (a) Use the graph to find the formula for the revenue R(x). 180- R(x) = 120- 60 0- -60- $ 9 10 11 12 13 14 -120- -180- items produced, x (in thousands)