Answers

2014-11-20T20:00:31+08:00
1 bacteria in 1 hour = 2 bacteria 
2 bacteria in 2 hours = 4 bacteria
4 bacteria in 3 hours = 8 bacteria 
so therefore in three hours there are 8 bacteria 

Hope THis Helps :) 
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2014-11-20T20:25:20+08:00