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December 28, 2014

December 28, 2014

Posted by **esa** on Thursday, January 19, 2012 at 11:57am.

- arithmetic -
**Reiny**, Thursday, January 19, 2012 at 12:55pma + 3d + a + 7d = 10

2a + 10d = 10

a + 5d = 5

a+5d + a+11d = 22

2a + 16d = 22

a + 8d = 11

subtract them

3d = 6

d = 2

back into the first

a + 5d = 5

a + 10 = 5

a = -5

first 3 terms are -5, -3, -1

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