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OpenStudy (anonymous):
which expression shows that 11+7=5+13 a. (5+6)+7=5+(6+7) b. 6+6+6=18 c. 5+9+4=6+7+5 d. (11+4)+3=(5+7)+6
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OpenStudy (anonymous):
seems like all of em
OpenStudy (anonymous):
But I mostly think A is the answer
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