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Initially 500 milligrams of a radioactive substance were present After 3 days the mass had...

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Initially 500 milligrams of a radioactive substance were present After 3 days the mass had decreased by 145 milligrams If the rate of decay is proportional to the amount of the substance present at time t find the amount remaining after 10 days rounded to the nearest milligram Present your work in an organized manner and Box your Final Answer

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