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Mathematics 21 Online
OpenStudy (anonymous):

HELP PLEASE! Indicate which property is illustrated in Step 1. Step 1 7x + 7 + 12x + 12 = (7x + 7) + (12x + 12) Step 2 = 7x + (7 + 12x) + 12 Step 3 = 7x + (12x + 7) + 12 Step 4 = (7x + 12x) + (7 + 12) Step 5 = (7 + 12)x + (7 + 12) Step 6 = 19x + 19 distributive arithmetic fact commutative associative

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