A factory is discharging pollution into a lake at the rate of: r(t)=tsquare root t2+16 tons per year where tt  is the number of years that the factory has been in operation.  Find the total amount of pollution discharged during the first 3 years of operation using u-substitution.  Keep your answer in exact form.  You must show your work for credit on this problem.   Include units in your response.

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