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Mathematics 20 Online
OpenStudy (anonymous):

Indicate which property is illustrated in Step 6. Step 1 2x + 12 + 9x + 9 = (2x + 12) + (9x + 9) Step 2 = 2x + (12 + 9x) + 9 Step 3 = 2x + (9x + 12) + 9 Step 4 = (2x + 9x) + (12 + 9) Step 5 = (2 + 9)x + (12 + 9) Step 6 = 11x + 21 A. associative B. distributive C. arithmetic fact D. commutative

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