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September 18, 2014

September 18, 2014

Posted by **bob** on Wednesday, August 11, 2010 at 5:40pm.

What is the first term of the sequence?

explain how to do this please

- arithmetic -
**Reiny**, Wednesday, August 11, 2010 at 6:37pmyou know t6 = a+5d

you know t15 = a+14d

so a+5d + a+14d = -141

don't you know d= -7 ???

take over ....

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