Tuesday
September 30, 2014

Homework Help: math

Posted by Ellie on Sunday, October 25, 2009 at 8:45pm.

-Write the arithmetic sequence 21,13,5,-3... in the standard form:
a_n=

-a_n=a_1+(n-1)d--so a_n=21+(n-1)-8

*a_n=-168-8n
why isnt this right?

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