30 = (3)(10) and 21 = (3)(7)
So, 3(10 + 7) = (3)(10) + (3)(7) = 30 + 21 = 51
Michelle C.
asked 09/20/1930 = (3)(10) and 21 = (3)(7)
So, 3(10 + 7) = (3)(10) + (3)(7) = 30 + 21 = 51
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