Answer:
Option C - Commutative property of addition
Step-by-step explanation:
Given : 7 + 9 + 3 = 7 + 3 + 9
To find : Which mathematical property is demonstrated?
Solution :
The given expression is 7 + 9 + 3
Now, we see there is an interchanging of position of 3 and 9.
which represent the commutative property.
There is addition in between the numbers.
So, the mathematical property used in expression is 'commutative property of addition'.
Therefore, option C is correct.