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Please show all your work A sample of a radioactive substance decayed to 75% of its original amount after a year. (Round your answers to

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Please show all your work

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A sample of a radioactive substance decayed to 75% of its original amount after a year. (Round your answers to two decimal places.) (7 points) (a) What is the half-life of the substance? (b) How long would it take the sample to decay to 85% of its original amount

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