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Element X is a radioactive isotope such that every 82 years its mass decreases by half Given that the initial mass of a sample of

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Element X is a radioactive isotope such that every 82 years its mass decreases by half Given that the initial mass of a sample of Element X is 8900 grams how long would it be until the mass of the sample reached 7700 grams to the nearest tenth of a year

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