Algebra-1

A. The identity property of addition states that adding zero to any number does not change the value of that number. In other words, for any number a: a+0=a.

This property highlights that zero is the additive identity because it leaves other numbers unchanged when added to them.

B. The equation 9+3=3+9 demonstrates the commutative property of addition. This property states that changing the order of the addends does not change the sum.

So the correct answer is: B. Commutative property.

C. The associative property of addition states that the way in which numbers are grouped when adding does not change the sum....