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December 21, 2014

December 21, 2014

Posted by **Riana** on Tuesday, January 1, 2013 at 6:27pm.

arithmetic series question

- math -
**Reiny**, Tuesday, January 1, 2013 at 7:27pma+10d = 19

a+16d = 61

subtract them

6d = 42

d = 7

a + 70 = 19

a = -51

sum(12) = (12/2)(-102 + 11(7) ) = -150

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