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January 31, 2015

January 31, 2015

Posted by **Erica** on Monday, March 19, 2012 at 5:07pm.

- Math -
**bobpursley**, Monday, March 19, 2012 at 5:55pmafter one hour, 3

after two hours, 9+3

after three hours, 27+9+3

so this is a geometric series,

3,9,27, ...3^t

The sum of a geometric series is

St=(1-3^t)/(1-3)=(1-3^t)/-2

or

8500*(-2)=1-3^t

-17000=-3^t

log17000=tlog3

t=8.86, but t is an integer, so t=9 hours.

check my work.

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