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Mathematics, 27.10.2020 22:10 aprilreneeclaroxob0c
If 14 g of a radioactive substance are present initially and 7 years later only 7 g remain, how much of the substance will be present after 9 yr?
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If 14 g of a radioactive substance are present initially and 7 years later only 7 g remain, how much...
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