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Mathematics, 25.06.2019 15:30 itsgiovanna
In a radioactive substance half-life is 40 years about how much of a 30g sample was left after 160 yearsa 1.9b 3.8c 7.5d 15
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In a radioactive substance half-life is 40 years about how much of a 30g sample was left after 160 y...
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