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 four-hour time intervals are shown in the table. t (hr) r(t) (L/h) 0 8.1 4 7.4 8 6.8 6.3 5.8 5.3 Find lower and upper estimates for the total amount of liquid that leaked out. lower estimate = 12 16 20 upper estimate = liters liters

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