the sum of the first ten terms of an arithemetic series is 50, and the sum of the first twenty terms is 180. find the common difference and the first term of the series.

ok this is not going well.... thanks for any help

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- November 2nd 2008, 02:55 AMpop_91yes another one....
the sum of the first ten terms of an arithemetic series is 50, and the sum of the first twenty terms is 180. find the common difference and the first term of the series.

ok this is not going well.... thanks for any help - November 2nd 2008, 03:07 AMmr fantastic
- November 2nd 2008, 03:09 AMpop_91
ooooooooooh i didnt think of doing that!

thank you