Suppose that the demand function for a product is given by D(p= 50,000/p and that the price p is a function of time given by p= 1.9t+11, where t is in days. a) find the demand as function of time t b) find the rate of change of the quantity demanded when t= 90 days a) D(t)= b) what is the approximate rate of change of the quantitiy demanded when t=90 days  units/days

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