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.  0 7.4 5 6.7 10 6.1 15 5.6 20 5.1 25 4.6 ind lower and upper estimates for the total amount of liquid that leaked out. lower estimate =  liters upper estimate =  liters

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