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May 30, 2015

Homework Help: algebra

Posted by lee on Tuesday, February 12, 2013 at 11:29am.

I have 3 questions I need help with.
1) what is the 15th term of the sequence 81,27,9,...

2) what is a possible value for the missing term of the geometric sequence 39,_,975,_

3) what is the sum of the finite arithmetic series (-5)+0+5+10+..+65

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