Answer:
The statement 5.5 + 0 = 5.5 is an example of the additive identity property. This property states that when you add zero to any number, the sum is that same number. In other words, zero is the "identity" element for addition because it does not change the value of the other number.
In this case, adding zero to 5.5 results in 5.5 because 0 doesn't add or subtract anything from 5.5. So, the sum is simply 5.5, which is the original number.
The associative property of addition states that you can change the grouping of the numbers being added without changing the result. The commutative property of addition states that you can change the order of the numbers being added without changing the result. However, neither of these properties apply to the expression 5.5 + 0 because there is only one number being added and no grouping or order to change.
therefore the correct answer is Additive Identity.