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 8.1 5 7.4 10 6.8 15 6.2 20 5.7 25 5.2 Find lower and upper estimates for the total amount of liquid that leaked out of the tank in the first 25 hours. lower estimate = liters upper estimate = liters