Question 21 Use the chain rule to find the derivative of f(x) =3(4x* + 615) 12 You do not need to expand out your answer. f(I)Question 22 Use the chain rule to find the derivative of f(x) = 2p fri-8" f(I). Question 23 Suppose a. product's revenue function is given by RM] = 2'r,l2 mug, where RM] is in dollars and g is units sold. Find a numeric value for the marginal revenue at 34 units. mam}: =| 5 per unit Question 26 Given that f(x) = 1"h(x) h(-1) = 5 h'(-1) = 8 Calculate f(-1). Hint: Use the product rule and the power rule