Fill in the blanks. Then, choose the property of addition you used.
(a) 4 + ( 3 + 7 ) = ( 4 + 3 ) + 7
(b) 6 + 0 = 6
(c) 9 + 2 = 2 + 9
(a) 4 + (3 + 7) = (4 + 3) + 7 (Associative Property of Addition)
(b) 6 + 0 = 6 (Identity Property of Addition)
(c) 9 + 2 = 2 + 9 (Commutative Property of Addition)