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 three- hour time intervals are shown in the table. t (hr) r(t) (L/h) 9.2 8.7 8.2 9. 7.8 12 7.4 15 Find lower and upper estimates for the total amount of liquid that leaked out. lower estimate = liters upper estimate = liters

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