I don't know what to do.

1. A 12,000-liter tank of water is filled to capacity. At time t = 0, water begins to drain out of the tank at a rate modeled by r(1), measured in liters per hour, where r is given by the piecewise-defined function 600t r(t) =31+3' OSIS5 1000e-021 1> 5 Find r'(3). Using correct units, explain the meaning of the value in the context of this problem. 2. The Apple Store is having a 12-hour sale. The total number of shoppers who have entered the store t hours after the sale begins is modeled by the function S defined by S(t) = 0.51* -1613 +1441 for Ost