Which of the following does not utilize the commutative property (there may be more than one property used)?
?
A.
?5(x + 4) = 5x + 5(4) = 5x + 4(5)
B.
?
C.
?a + (b + c) = (a + b) + c
D.
?a + (b + c) = (b + a) + c
E.
?None of the above.
Answer: C
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