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April 18, 2015

April 18, 2015

Posted by **Embraced** on Wednesday, January 11, 2012 at 7:18pm.

- Algebra 2 -
**Steve**, Thursday, January 12, 2012 at 12:19amJust as in your other post,

Sn = n/2 (a1 + an)

Only this time we want a1

77 = 7/2 (a1 + 30)

154 = 7a1 + 210

-56 = 7a1

a1 = -8

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