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A radioactive substance decays exponentially. A scientist begins with 170 milligrams of a radioactive substance. After 30 hours, 85 mg of the substance remains. How

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A radioactive substance decays exponentially. A scientist begins with 170 milligrams of a radioactive substance. After 30 hours, 85 mg of the substance remains. How many milligrams will remain after 48 hours? -mg Give your answer accurate to at least one decimal place. Check Answer E

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