Answer: 
Step-by-step explanation:
The given expression: 
i.e. a product of 7 and xy.
The operation used here: Multiplication.
Commutative property of multiplication :-
for any numbers a and b.
Associative property of multiplication :-
for any numbers a , band c.
Now,
[Associative property of multiplication]
[Commutative property of multiplication]
[Associative property of multiplication]