Fill in the blanks. Then, choose the property of addition you used.
(a) 6 + 7 = 7 + 6
(b) 5 + ( 4 + 3 ) = ( 5 + 4 ) + 3
(c) 5 + 0 =5
(a) The property of addition used is the commutative property.
(b) The property of addition used is the associative property.
(c) The property of addition used is the identity property.