An arithmetic series is 8 + 3 - 2 - 7 - 12 - 17 - ... . Which choice represents

Algebra
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An arithmetic series is 8 + 3 - 2 - 7 - 12 - 17 - ... . Which choice represents the series in sigma notation?

May 18th, 2015

      This series is easy to spot.  It's the sum of the squares from 1 to 9![img src="http://home.windstream.net/okrebs/eq13-7.gif" height="45" width="40">
    5)  Notice this is an arithmetic series. Must use the formula to find the explicit formula.  d = 4, first term is 5 and counting the terms, the eighth term is 33.
5 + (n - 1)4 = 5 + 4n -4 = 4n +1
    [img src="http://home.windstream.net/okrebs/eq13-8.gif" height="45" width="72">
    6)  Notice that this series is geometric. r = -1/3, first term is 1 and the last term -1/243 is the 6th term!  Use the geometric formula!
1( -1/3)(n - 1) = (-1/3)(n - 1

May 18th, 2015

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May 18th, 2015
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May 18th, 2015
Dec 7th, 2016
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