Question

Use the associative property to finish the equation: (4x + 2) + x =
A. 4x + (2 + x)
B. (2 + 4x) + x
C. x + (4x + 2)
D. 4x + (x + 2)

Answer 1

The right answer is D.
For more info on associative property: http://en.wikipedia.org/wiki/Associative_property

Answer 2

A) (4x + 2) + x = 4x + (2 + x)

The Associative Property is the grouping property. The order of the variables being grouped does not change. Hence, Answer A is correct. Answer D is an illustration of the Commutative Property.

Examples of Associative Property

Addition
(2 + 3) + 5 = 2 + (3 + 5)

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