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Current Attempt in Progress Radioactive Decay. The mass m(t) remaining after t hours from a 50-gram sample of a radioactive substance is given by the

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Current Attempt in Progress Radioactive Decay. The mass m(t) remaining after t hours from a 50-gram sample of a radioactive substance is given by the equation m(t) = 50e-0.0561 . After how long will only 20 grams of the substance remain? Round your answer to the nearest hour

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