City water, which is slightly chlorinated, is being used to flush a tank of heavily chlorinated water. The concentration C C(t) of the chlorine in the tank t hours after flushing begins is given by the following formula. C = 0.2 + 2.79e 0.31t milligrams per gallon (a) What is the initial concentration of chlorine in the tank? mg/gal (b) Express the concentration of chlorine in the tank after 6 hours using functional notation. Calculate the concentration of chlorine in the tank after 6 hours. (Round your answer to two decimal places.) mg/gal

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