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January 26, 2015

January 26, 2015

Posted by **Melissa** on Saturday, December 17, 2011 at 12:44am.

- Math -
**Steve**, Saturday, December 17, 2011 at 5:56amjust use the formulas you have:

T12 = ar^11 = 49

T14 = ar^13 = 2401

T14/T12 = r^2 = 49

so, r = 7 or -7

T15 = T14 * r = 16807 or -16807.

Can't tell, since we don't know whether r is 7 or -7.

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