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A scientist begins with 80 milligrams of a radioactive substance that decays exponentially. After 20 hours, 40 mg of the substance remains. How many milligrams

A scientist begins with 80 milligrams of a radioactive substance that decays exponentially. After 20 hours, 40 mg of the substance remains. How many milligrams will remain after 31 hours? Use at least six decimal places during calculations and round final solution to the nearest tenth. Show all work possible

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