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Mathematics 7 Online
OpenStudy (kikuo):

http://prntscr.com/as0dml We are supposed to tweak this theorem to figure out this problem. I attempted it, but I got the wrong answer. I did 166.5=1/2(9)(15+b) then divided 166.5 by 2, then 9, and then took away 15.

OpenStudy (kikuo):

Theorem. http://prntscr.com/as0e2t

OpenStudy (triciaal):

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