A 3 comma 072-liter cistern is empty when water begins flowing into it (at tequals0) at a rate (in L/min) given by Upper Q prime (t )equals 9 StartRoot t EndRoot comma where t is measured in minutes. a. How much water flows into the cistern in 0.75 hour? b. Find the function that gives the amount of water in the tank at any time t greater than or equals 0. c. When will the tank be full?