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A biologist has an 8535-gram sample of a radioactive substance. Find the mass of the sample after four hours if it decreases according to a

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A biologist has an 8535-gram sample of a radioactive substance. Find the mass of the sample after four hours if it decreases according to a continuous exponential decay model, at a relative rate of 13% per hour. Do not round any intermediate computations, and round your answer to the nearest tenth. grams X

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