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bekas [8.4K]
3 years ago
7

If a radioactive substance's half-life is 20 years, how much of a 40-gram sample will be left after 60 years?

Biology
2 answers:
umka21 [38]3 years ago
7 0

The answer is C. 20 grams.

gavmur [86]3 years ago
6 0
20 is your answer
hope this helps
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