Answer
a. Associative property of addition
b. Commutative property of addition
c. Commutative property of addition
Work Step by Step
a. Since the grouping of the letters was changed and their order was not, this is true by the associative property of addition.
b. Since the order of the letters was changed and their grouping was not, this is true by the commutative property of addition.
c. Since the order of the letters was changed and their grouping was not, this is true by the commutative property of addition.