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Solve the problem. 9) Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) =

Solve the problem. 9) Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) = 160e-.70t Find the rate of decay of the quantity present at the time when t = 4. A) 16.3 grams per year B) -16.3 grams per year C) 6.8 grams per year D) -6.8 grams per year

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