15. Find the value of
N in (6 + 7) + 3 = 6 + (N + 3).
A. N = 13
B. N = 10
C. N = 7
D. N= 9

16. Identify the property used in number 15.
A. Associative Property
B. Commutative Property
C. Distributive Property
D. Inverse Property

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