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Mathematics 15 Online
OpenStudy (anonymous):

Could someone please explain how to do this? Using sigma notation, describe the total length of 7 pictures hung side-by-side. Then find the total length the pictures occupy along the wall if the first picture has a length of 10 inches and the length of each successive picture is 4 inches longer than the previous one.

OpenStudy (unklerhaukus):

\[\sum_{n=0}^610+4n=7\times10+4\sum_{n=0}^7n=7\times10+4\sum_{n=1}^6\]

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