Answer:
commutative property
Step-by-step explanation:
You switched the numbers inside the parenthesis, which in this case is 5 and -5.
Feet i think, thats how they lable the size of a home when your buying
im not 100% sure though
Here is how to work it with long division.
The answer is B : 720
If you want to learn more on HOW to do this , message me :) !
