Biology, 28.08.2019 11:30 xxaurorabluexx

If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years? a. 5 grams b. 10 grams c. 20 grams d. 30 grams

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If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after...

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