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Mathematics 21 Online
OpenStudy (anonymous):

Indicate which property is illustrated in Step 1. Step 1 4 + (4 + 7) + 0 = 4 + (7 + 4) + 0 Step 2 = (4 + 7) + (4 + 0) Step 3 = (4 + 7) + 4 Step 4 = 11 + 4

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