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I have a homework question and I don't know how to get the answer at the back of the textbook. "The fish population, in thousands, in a lake at time t, in years, is modelled by the following function: p(t) = {3+1/12t^2 if 0 <_ t <6, 2+1/18t^2 if 6 < t <_12. There is a sudden change in...