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Mathematics 12 Online
OpenStudy (anonymous):

A laboratory has 20 grams of a radioactive substance that decays in such a way that t days later the number of grams left will be y = 20 (1/10)t/15. How many days does it take for half of the substance to decay? A. 4 B. 4.5 C. 9 D. 9.5

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