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Q17 The amount Q, in mg, of a radioactive substance that is present at time t, in years, is given by the formula Q =

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Q17

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The amount Q, in mg, of a radioactive substance that is present at time t, in years, is given by the formula Q = 40(0.5) 20 How much is present initially? b) Find the half-life and use the half-life to complete the table. c) By what percent does Q decay each year? a) The amount that is present initially is mg

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