SOLUTION: The amount of a radioactive tracer remaining after t days is given by A=A0 e^-0.18t, where A0 is the starting amount at the beginning of the period. How much should be aquired now

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: The amount of a radioactive tracer remaining after t days is given by A=A0 e^-0.18t, where A0 is the starting amount at the beginning of the period. How much should be aquired now      Log On


   

Question 46769This question is from textbook
: The amount of a radioactive tracer remaining after t days is given by A=A0 e^-0.18t, where A0 is the starting amount at the beginning of the period. How much should be aquired now to have 40 grams remaining after 3 days? Thanks
Choices are:
a.) 47.9 gm
b.) 48.8 gm
c.) 61.6 gm
d.) 68.6 gm This question is from textbook

Answer by adamchapman(301) About Me  (Show Source):
You can put this solution on YOUR website!
I will start where you left off:
40=A%5B0%5D+e%5E%28-0.18t%29+
t=3
40=A%5B0%5D+e%5E%28-0.54%29+
40%2F%28e%5E%28-0.54%29%29=A%5B0%5D+
A%5B0%5D+=68.6grams

I hope this helps,
Adam
P.S. please visit my website, it may be helpful to you. The address is www.geocities.com/quibowibbler