Use good notation and show all of your work. Write solutions to word problems a complete sentence. 1. Find the cost function for each marginal cost function. (a) C(x)=x2/3+2,8 units cost $58. (b) C(x)=0.03e0.01x, fixed cost is $8 2. Find the demand function for each marginal revenue function. (a) R(x)=2500.04x0.09x3 (b) R(x)=700e0.0002x 3. The marginal profit for the Moorhead Freeze is given, in thousands of dollars, by P(x)=x+21, where x is the sales volumes in thousands of hamburgers. The "proft" is $1000 when no hamburgers are sold. Find the profit function..