<PRE><B>Question 1131577</B>
The number of bacteria in a certain population increases according to a continuous exponential growth model with a growth rate of 8.6% per hour. How many hours does it take for the size of the sample to double? 
----
N = N*r^t
2A = A*1.086^t
----
1.086^t = 2
t = log(2)/log(1.086)
t = 8.4 hours
----
Cheers,
Stan H.
----------
</PRE>