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Mathematics
OpenStudy (anonymous):

In the following example of "Simplifying an Expression", what reason would be used for step B? Simplify the expression 3k + 7 + 2k and justify each step 3k + 7 + 2k = 3k + 2k + 7 A =( 3k + 2k )+ 7 B = (3 + 2) k + 7 C = 5k + 7 D A. Addition B. Commutative Property C. Associative Property D. Distributive Property

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