Collaborative Mathematics: Challenge 09

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My colleague Jason Ermer at Collaborative Mathematics has just published Challenge 09 on his website:

http://www.collaborativemathematics.org/challenge09.html

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Published by John Quintanilla

I'm a Professor of Mathematics and a University Distinguished Teaching Professor at the University of North Texas. For eight years, I was co-director of Teach North Texas, UNT's program for preparing secondary teachers of mathematics and science.

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