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

Question

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

espex · Answer

Step B  is simply to illustrate how the two are associated, thus the associative property is the correct answer.