A 50-gal barrel is filled completely with pure water. Saltwater with a concentration of 0.3 lb/gal is then pumped into the barrel, and the resulting mixture overflows at the same rate. The amount of salt in the barrel at time t is given by Q (t) = 15 (1 – e-0.04r ) where t is measured in minutes and %3D Q(t) is measured in pounds.

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