SOLUTION: Find the half-life to the nearest tenth of a year of a radioactive substance that decays from 65 mg to 17.55 mg in 20years according to the exponential decay model y = ae^−bx

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Question 975955: Find the half-life to the nearest tenth of a year of a radioactive substance that decays from 65 mg to 17.55 mg in 20years according to the exponential decay model y = ae^−bx where a is the initial amount and y is the amount remaining after x years.
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