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I need help Solve the problem. Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by

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Solve the problem. Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) = 540e-0.19t. Find the rate of change of the quantity present at the time when t = 4. O -2.1 grams per year 2.1 grams per year 48 grams per year O -48 grams per year

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