Tuesday

April 21, 2015

April 21, 2015

Posted by **Anonymous** on Wednesday, February 29, 2012 at 10:47am.

- arithmetic sequence -
**Steve**, Wednesday, February 29, 2012 at 12:39pm6(a+5d) = 15(a+14d)

6a + 30d = 15a + 210d

9a = -180d

a = -20d

a + 20d = -20d + 20d = 0

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