1. Commutative: the result is the same if operands are commutated. $x + y$ is the same as $y + x.$ Assosicative: $x + y + z$ is the same as $(x + y) + z$ as $x + (y + z)$. It doesn't matter if you assigned an order (also: associate) to $(x+y)$ before $(y + z)$ and vice versa.
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From Wikipedia, the free encyclopedia. The 82nd Academy Awards ceremony, presented by the Academy of Motion Picture Arts and Sciences (AMPAS), honored the best films of 2009 and took place on March 7, 2010, at the Kodak Theatre in Hollywood, Los Angeles beginning at 5:30 p.m. PST / 8:30 p.m. EST.