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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 number of grams left will be y = 20(1/10)t/15. How much will be present after 15 days?
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OpenStudy (kc_kennylau):
\[y=20\left(\frac1{10}\right)^{\dfrac t{15}}\]
OpenStudy (kc_kennylau):
Just substitute t=15 inside :)
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