Liquid leaked from a damaged tank at a rate of r(t) liters per hour. The rate decreased as time passed and values of the rate at five-hour time intervals are shown in the table. t (hr) r(t) (L/h) 0 10.6 5 9.5 10 8.6 15 7.7 20 6.9 25 6.2 Find lower and upper estimates for the total amount of liquid that leaked out. lower estimate liters upper estimate liters