SOLUTION: a bacteria culture doubles in size in 8 hours. how long will it tak for the size to triple? assume that the rate of increase of the culture is proportional to the size.

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: a bacteria culture doubles in size in 8 hours. how long will it tak for the size to triple? assume that the rate of increase of the culture is proportional to the size.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 718776: a bacteria culture doubles in size in 8 hours. how long will it tak for the size to triple?
assume that the rate of increase of the culture is proportional to the size.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
First find k in the relationship, A=Pe%5E%28kt%29, where t is time in hours, P is initial population, A is population at time t. The 8 hour case gives you 2P=Pe%5E%28k%2A8%29. Next step, divide both sides by P. Next, take logarithms of both sides. Maybe this will be enough for you to know how to finish.