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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

OpenStudy (anonymous):

Which of the properties is concerned with grouping?

OpenStudy (anonymous):

Im sorry, im not sure what you mean.

OpenStudy (anonymous):

Well, in step A we had the sum ungrouped, and in step B it is grouped. Which rule says that we can do that?

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