Problema Solution
A biologist finds that the population of a certain type of bacteria doubles each half-hour. An initial culture has 70 bacteria.
How long will it take for the number of bacteria to reach 4,480?
Answer provided by our tutors
A=P(1+r)^t
4480=70(1+1)^t
64=2^t
ln 64 / ln 2 = t
6=t
it would take 6 half-hour periods
3 hours
5760=90 * 2^t
64 = 2^t
ln 64 / ln 2 = t
6 = t