## anonymous 5 years ago Situation: a 48 gram sample of substance that's used for drug research has a k-value of 0.1325. Find the substance's half-life, in days. Round your answer to the nearest tenth

1. anonymous

same as last one $\frac{1}{2}=e^{-.1325t}$ $ln(.5)=-.1325t$ $t=\frac{ln(.5)}{-.1325}$ $t=5.23$

2. anonymous

i guess in general you can see that the answer will be $\frac{ln(.5)}{-k}$