1.
Indicate which property is illustrated in Step 2.

Step 1 7x + 3 + 5x + 1 = (7x + 3) + (5x + 1)
Step 2 = 7x + (3 + 5x) + 1
Step 3 = 7x + (5x + 3) + 1
Step 4 = (7x + 5x) + (3 + 1)
Step 5 = (7 + 5)x + (3 + 1)
Step 6 = 12x + 4

Question

1.
Indicate which property is illustrated in Step 2.

Step 1	7x + 3 + 5x + 1	=	(7x + 3) + (5x + 1)
Step 2		=	7x + (3 + 5x) + 1
Step 3		=	7x + (5x + 3) + 1
Step 4		=	(7x + 5x) + (3 + 1)
Step 5		=	(7 + 5)x + (3 + 1)
Step 6		=	12x + 4

math&ing001 · Answer

Addition has the commutative and associative property.
The one on step 2 is the associative property.