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 two-hour time intervals are shown in the table. t (hr) r(t) (L/h) 8.9 2 8.7 4 8.4 6 8.2 8 8 10 7.8 Find lower and upper estimates for the total amount of liquid that leaked out. lower estimate = liters upper estimate = liters

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