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An initial sample of 428 g of a radioactive substance decays according to the function A(t) = 428e-0.038t where t is given in years.

An initial sample of 428 g of a radioactive substance decays according to the function A(t) = 428e-0.038t where t is given in years. (a) How many grams of the substance will remain after 124 years? Round your answer to one decimal place. (b) What is the half-life of the substance? Round your answer to one decimal place.

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