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A laboratory has a 280-g sample of nitrogen-13 which has a half-life of approximately 45 minutes. Write an equation to represent the mass of the

A laboratory has a 280-g sample of nitrogen-13 which has a half-life of approximately 45 minutes. Write an equation to represent the mass of the sample, y grams, left after n half-lives.How many half-lives will have elapsed in 3 hours? How much of the sample is left after 3 hours?

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