Posted by Garz on Monday, March 26, 2012 at 7:27pm.
A certain bacterium divides into 2 bacteria every 20 minutes. If there are four bacteria in the culture now, how many will there be in 4 hours, assuming that no bacteria die?

Math  Steve, Tuesday, March 27, 2012 at 10:36am
population doubles every 20 minutes, or 3 times per hour. So, every hour, the population grows by a factor of 8.
So, since we are starting at p(0) = 4,
p(h) = 4*8^h
gives the population after h hours.
p(4) = 4*8^4 = 4*4096 = 16384 
Math  Tsamchoe, Sunday, November 25, 2012 at 3:59pm
X=N.2n
X=N.2(48)
X=N(24)
X=24 
Math  Anonymous, Monday, November 30, 2015 at 9:39pm
idk