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20F^(2) PRE CALCULUS B Polonium -210(Po-210) has a half-life of 138 days. How long does it take for 80% of a sample of Po-210 to

20F^(2) PRE CALCULUS B Polonium -210(Po-210) has a half-life of 138 days. How long does it take for 80% of a sample of Po-210 to decay? a 2 answers

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