Download a certain radioactive substance has a half life of 38 hours. find how long it takes for 80

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a certain radioactive substance has a half life of 38 hours. find how long it takes for 80 a certain radioactive substance has a half life of 38 hours. find how long it takes for 80 a certain radioactive substance has a half life of 38 hours. find how long it takes for 80

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Download this and online watch a certain radioactive substance has a half life of 38 hours. find how long it takes for 80
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