1. Let C(x) be the cost (in dollars) of producing x units of a product per day. Suppose C(99) =90 and C'(99)=-6. Estimate the cost of producing 100 items per day. 2. Consider the Cost function C(x)= 5x^3 - 4/x^2. What is the marginal cost at the production level x=2? 3. If f(1)= -1 and f'(1)=-4 , find g'(1) , where g(x) = [f(x)]^-3