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Element X decays radioactively with a half life of 5 mins. If there are 700 grams of Element X, how long, to the nearest tenth

Element X decays radioactively with a half life of 5 mins. If there are 700 grams of Element X, how long, to the nearest tenth of a min, would it take the element to decay to 20 grams? Y=a(.5)^t/h

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