Math: I need help with #7

Help please!! I cannot come up with an answer

http://i48.tinypic.com/iemqvn.jpg

C(n) = 2^(n-1), where n is the generation number.

So this is just:

C(25) = 2^(25-1)
C(25) = 2^24
C(25) = 16777216

So there will be 16,777,216 e.coli bacteria in the 25th generation.

C(n)= 2^(n-1)

so C(25)= 2^24

It's 2^24 if I'm not mistaken

maannnnnnnnnnnn math should be banned

This looks like rocket science,, I feel dumb lol