Friday
April 18, 2014

Homework Help: math

Posted by jonny on Friday, August 24, 2012 at 9:51am.

An eighth-grade student claims she can prove that subtraction
of integers is commutative. She points out that if a
and b are integers, then a-b = a+ -b. Since addition is
commutative, so is subtraction. What is your response?

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