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OpenStudy (anonymous):
Which property would allow you to use mental computation to simplify the problem 23 + (7 + 9)? a) associative property of addition b) distributive property c) additive identity d) additive inverse
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OpenStudy (anonymous):
i would use associative property, and add 23+7 first, that gives me 30, next simply i add 9, that makes it 39 !
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