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