30.000 Suppose that the demand function for a product is given by D(p) = p and that the price p is a function of time given by p = 1.9t + B, where t is in days. a) Find the demand as a function of time t. b) Find the rate of change of the quantity demanded when t: 85 days E) a) 0m 2 D {Simplify your answer.) b) What is the approximate rate of change of the quantity demanded when t= 85 days? unhs El day ' (Simplify your answer. Round to three decimal places as needed.)