Mathematics, 28.03.2021 05:00 lakaralake11
The half-life of radium is 1690 years. If 90 grams are present now, how much will be present in 400 years?
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Mathematics, 22.06.2019 00:00, olgapagan1010
At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?
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The half-life of radium is 1690 years. If 90 grams are present now, how much will be present in 400...
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