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The decay of 277 mg of an isotope is described by the function A(t)= 277e -0.019t , where t is time in years. Find the

The decay of 277 mg of an isotope is described by the function A(t)= 277e-0.019t, where t is time in years. Find the amount left after 64 years. Round your answer to the nearest mg. Show all of your work for full credit.

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