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2. (10 points] The half-life of cesium-137 is 20 years. How long would it take for an 80-mg sample of cesium-137 to decay exponentially until

2. (10 points] The half-life of cesium-137 is 20 years. How long would it take for an 80-mg sample of cesium-137 to decay exponentially until only 1 mg remains? (Simplify your answer as far as you can without a calculator.)_

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