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OpenStudy (anonymous):
A laboratory has 20 grams of a radioactive substance that decays in such a way that 't' days later the # of grams left will be y=20(1/10)^(t/15). How many days does it take for half the substance to decay?
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OpenStudy (anonymous):
Half the substance will be 10 grams. Set your output to 10... 10=20(1/10)^(t/15) and solve for t.
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