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Why vector addition is commutative:  Page 1,  Page 2

Cobb-Douglas plots of surfaces from lecture on 9/18/06

Other wonderful plots of various surfaces, along with their level curves (including f(x,y) = xy from lecture)

Solutions to Gold Version of Exam 1 (Solutions to Yellow Version similar!)

Solutions to Pink Version of Exam 2

Solutions to Exam 3

Solutions to Exam 4