This stuff is making me bang my head against the wall. I understand the concept and notation of summation with no problems. It seems though for about every one problem I get right there is five I get wrong. The only thing I can think I'm doing wrong is bad algebra habits or I'm using the summation properties and formulas at wrong times. I know I could work these problems the long way, but I'm missing the point of the lesson. Could someone please let me know what I'm doing wrong? Here is one I got right:(adsbygoogle = window.adsbygoogle || []).push({});

Here is one I got wrong:

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# Homework Help: Help with summation

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