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) lower estimate = upper estimate = 0 4 8 12 16 20 Find lower and upper estimates for the total amount of liquid that leaked out. liters 7.8 7.3 6.8 6.4 6 5.6 liters

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