The answer could possibly be -48+11=-37
So is doubling, first off, meaning, if the current amount say P, then when it doubles is 2P, or double that, or P + P, so the rate of growth is 100%, since it's doubling.
and is doing it every 9 hour cycle, thus
First you need to find a common denominator. 11/15 = 22/30
3/10= 9/30
9/30+22/30= 1 1/30
Hope this helps!
1 = 4 quarters
2 = 8 quarters
3 = 12 quarters
4 = 16 quarters
5 = 20 quarters
6 = 24 quarters
7 = 28 quarters
ooops. too much
6 and 3/4 = 27 quarters