Question

a 18 gram sample of a substance thats used to detect explosives has a k-value of 0.1226 find the substance's half life, in days round your answer to the nearest tenth
pleaseee helpp IM BEING TIMED!

Answer 1

ok here we go again

Answer 2

\[.5=e^{-.1226t}\]
\[\frac{ln(.5)}{-.1226}=t\]

Answer 3

http://www.wolframalpha.com/input/?i=ln%28.5%29%2F-.1226

Answer 4

rounded to the nearsest tenth i get 5.7

Answer 5

it's an integral problem. I don't think you saw it.

Answer 6

link@mertsj

Answer 7

IT WAS RIGHTTTTTT! 0THANK YOU

Answer 8

imagine. thank the lord