Answers

2014-11-17T20:45:12+08:00
A. 1hour is 60 minutes. how many "15 mins" in 60 mins? 4.
    4 x 2 x 2 x 2 x 2=64

b. 2048= 4 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2
    So 9. 9 times 15 minutes is  135 minutes.
     135 minutes or 2 hours and 15 minutes.
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2014-11-18T17:09:14+08:00
If there are 4 bacteria, then after 15 minutes it becomes 8,next 16, then 32 and lastly after 1 hour 64.
2 hours and 15 minutes
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