Suppose that we are interested in the amount of salt (in kg) at a certain moment in time, denoted by A(t), in a well-mixed, infinitely large tank with 1,100-L of water initially. Further, suppose we have set-up the experiment such that a salt solution containing 11 kg/L flows into the tank at a rate of 9 L/sec. If we allow the solution to flow out at 7 L/sec, then what is the volume of water in the tank at time t? V(t): in litres (DO NOT use commas in your answer) Construct a model for the change of salt in the tank at time t in seconds. [To ensure you are marked correct, please use A to represent the amount of salt in the tank at time t not A(t)]. dA (DO NOT use commas in your answer) dt

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