Water is pumped into an underground tank at a constant rate of 8 gallons per minute. Water leaks out of the tank at the rate of (t+1)^.5 gallons per minute for 0 ≤ t ≤ 120 minutes. At time t = 0, the tank contains 30 gallons of water.
(A) How many gallons of water leak out of the tank from time t = 0 until t = 3 minutes?
(B) How many gallons of water are in the tank at time t = 3 minutes?
(C) Write an expression for A(t), the total number of gallons of water in the tank at time t.
(D) At what time t, for 0 ≤ t ≤ 120, is the amount of water in the tank a maximum? Justify your answer.