Math Practice Problems 1. Below is a sketch of a function, y = f(x). N -24 -21 -18 -15 -12 -96 -3 9 12 15 18 21 24 dy a. For what values of x is = f'(x) < 0? dx dy b. For what values of x is = f'(x) > 0? dx C. For what values of x is f (x) at a minimum? d. For what values of x is f (x) at a maximum? 2. Find the marginal cost function for each of the following total cost functions, TC(q), where q is output. a. TC(q) = 100 + 10q