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September 20, 2014

September 20, 2014

Posted by **Babueddie** on Friday, January 20, 2012 at 7:41pm.

- math -
**Reiny**, Friday, January 20, 2012 at 10:51pma+12d = 27 , (#1)

a+6d = 3(a+d)

a+6d = 3a + 3d

3d = 2a

then 12d = 8a

in a+12d = 27

a + 8a = 27

9a = 27

a = 3

first term is 3

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