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Question

A 50-gallon barrel is filled completely with pure water. Salt water with a concentration of 0.3 pounds/gallon is then pumped into the barrel, and the resulting mixture overflows at the same rate. The amount of salt (in pounds) in the barrel at time t (in minutes) is given by Q(t) = 15(1 − e−kt) where k > 0.(a) Find k if there are 5.5 pounds of salt in the barrel after 10 minutes. Round your answer to 4 decimal places.

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