Suppose f and g are two differentiable functions such that f'(9) = 56, f(9) = -7,g (9) = 28, g(9) = 21,g'(-7) = 6,9(-7) =0. Find K (-7) when k(x) = (1 + g(x))?. Answer: The demand equation for a textbook is given by P= 5000 43 4100 where q (measured in units of a thousand) is quantity demanded per week and p is the price in $. Find the marginal revenue (with respect to the quantity demanded) when the demand is 70000 textbooks. Pay attention to the units in the question. Round your final answer to 2 decimal places