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OpenStudy (anonymous):
a 40 gram sample of substance that's used for drug research has a k- value of .1472 find the substances half-life in days round your answer to the nearest tenth
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OpenStudy (anonymous):
\[m=m_0\:e^{kt}\\t=\frac{\ln(m/m_0)}{k}\] m : mass, t : time, k : decaying coefficient
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