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Initially 28 grams of radioactive substance was present. After 2 hours the mass had decreased by 8%. If the rate of decay is proportional to

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Initially 28 grams of radioactive substance was present. After 2 hours the mass had decreased by 8%. If the rate of decay is proportional to the amount of the substance present at a time It. Find the amount remaining after 19 hours Round your answer to 2 decimal places

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