Final answer:
The commutative property allows us to rewrite the expression X + 20 as 20 + X without changing its value.
Step-by-step explanation:
The commutative property states that the order of addition or multiplication does not affect the result. In this case, we can rewrite the expression X + 20 as 20 + X without changing its value. This is because addition is commutative, meaning that the order of the numbers being added doesn't matter.
Learn more about Commutative property in addition