Question: A certain radioactive isotope has an exponential decay model given by f(t)=20e -0.0567t , where t is given in months and there are initially 20

A certain radioactive isotope has an exponential decay model given by f(t)=20e^-0.0567t, where t is given in months and there are initially 20 g of the isotope. How long until 14g of the isotope remains?

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