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9. DETAILS A radioactive substance decays in such a way that the amount of mass remaining after + days is given by the function m(t)

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9. DETAILS A radioactive substance decays in such a way that the amount of mass remaining after + days is given by the function m(t) = 14e-0.019: where m(t) is measured in kilograms. (a) Find the mass at time t = 0. kg (b) How much of the mass remains after 46 days? (Round your answer to one decimal place.) kg

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