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Fermium-257 has a half-life of 100 days. A sample has a mass of 60 mg...

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Fermium-257 has a half-life of 100 days. A sample has a mass of 60 mg initially.I) What is the formula for finding the amount remaining after t days.II) When will there only be 5 mg remaining?A) y = 60(2) -t 100; 248 daysB) y = 60 e -t 100; 248 daysC) y = 60(2) -t 100; 358 daysD) y = 60e -t 100; 358 days

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