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A tank with a 200 gallon capacity contains 100 gallons of a toxic solution that contains 8 Ibs of pollutant. Fresh water is poured into the tank at a rate

of 7 gal/min and leaves the tank at a rate of 6 gal/min. a) Use a differential equation to find a function x(t) that represents the pounds of pollutant in the tank at time t. b) How much pollutant is in the tank when it overflows?

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