SOLUTION: I got stuck while solving this question: A quantity N is decreasing such that at time t, N = Noexp(-yt), where No is the amount at t = 0 and y = 0.5. Find the value of t when N

Algebra ->  Exponential-and-logarithmic-functions -> SOLUTION: I got stuck while solving this question: A quantity N is decreasing such that at time t, N = Noexp(-yt), where No is the amount at t = 0 and y = 0.5. Find the value of t when N      Log On


   



Question 1143691: I got stuck while solving this question:
A quantity N is decreasing such that at time t, N = Noexp(-yt), where No is the amount at t = 0 and y = 0.5. Find the value of t when N = No/5.

Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


N+=+N%280%29e%5E%28-.5t%29=N%280%29%2F5

e%5E%28-.5t%29+=+0.2

-.5t+=+ln%280.2%29

t+=+ln%280.2%29%2F-.5

Use a calculator....