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Answer:
A) Commutative
Step-by-step explanation:
The Associative has to do with re-grouping numbers. There are only two numbers so this does not apply here. Commutative is where you change the order; that's what the equation is demonstrating.
Bill paints 1/2 per hour. Bob paints 1/3 per hour. 1/2x+1/3x=1