The demand function for a certain product is given by: Find the marginal demand D'(p). Answer: : The population P, in thousands, of a small city is given 300t by P(t) = 21245 , where t is the time, in months. Find the growth rate. Answer:A certain company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of job is given by E(x) =10x+9, where x is the number of days since the start of the job. Use integration to find the expenditure if the job takes 6 days