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Initially 100 milligrams of a radioactive substance was present After 9 hours the mass had decreased by 4 If the rate of decay is proportional

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Initially 100 milligrams of a radioactive substance was present After 9 hours the mass had decreased by 4 If the rate of decay is proportional to the amount of the substance present at time t determine the half life of the radioactive substance Round your answer to one decimal place hr

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