the Initial is the C. The final is the y. t = 4
Divide .25 by 1.5 to get .167
So we do this now
Take a natural log of both sides to get
ln(.167=ln(e4k). ln and e cancel each other out since they are inverses of each other therefore the equation would look like this:
ln(.167)=4k. Divide by 4 to solve for k. This is your rate constant. ln of .167 = -1.789761. You would divide this answer by 4 to get teh k. k= -.447
This is telling you that it is decaying.
Since you have k. You can now solve for the time it takes for this to get to .10.
Follow the same steps. Divide .10 by 1.5. take ln of both sides then divide by -.447. You will have your answer. Thanks