Answer:
Associative property
Step-by-step explanation:
The given property is:
A + (B + C) = (A + B) + C
which is called "associative property of addition".
Hence, this property is used in the given expression which is "rearranging the parenthesis does not affect the result."
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807
