Which is an example of the associative property?
A.
3 • (x + 5) = 3 • x + 15
B.
x + 5 = 5 + x
C.
(x + 3) + 7 = x + (3 + 7)
D.
If x = a, and a = 7, then x = 7.
A.
3 • (x + 5) = 3 • x + 15
B.
x + 5 = 5 + x
C.
(x + 3) + 7 = x + (3 + 7)
D.
If x = a, and a = 7, then x = 7.
