A tank contains 50 lb of salt dissolved in 500 gallons of water. A brine solution is pumped into the tank at a rate of 5 gal/min; it mixes with the solution there, and then the mixture is pumped out at a rate of 5 gal/min. Determine A(t), the amount of salt in the tank at time t, if the concentration of salt in the inflow is variable and given by Cin(t) = 2 + sin(t/4) Ib/gal. A(t) = Ib

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Exponential Growth Model

The relation that represents an exponential function is: