I’m a couple months late with this, but my colleague Jason Ermer at Collaborative Mathematics has published Challenge 11 on his website: http://www.collaborativemathematics.org/
Collaborative Mathematics: Challenge 11
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. View all posts by John Quintanilla
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