Question: does this make sense or not : a toxic chemical decays with 1/2 life of 15 years, so 1/2 will be gone 15 years from

does this make sense or not : a toxic chemical decays with 1/2 life of 15 years, so 1/2 will be gone 15 years from now & rest will be gone in 30 years from now. 1. does it make sense or not and the toxic chemical will decay to and = amt. to these choices___(.25,.5,2)times the original amount

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