Which property does the following expression represent?

The expression \((4 + 7) + 3 = 4 + (7 + 3)\) represents the **Associative Property of Addition**.

This property states that the way in which the numbers are grouped in an addition problem does not change the sum. In this case, it shows that whether you add \(4\) and \(7\) first and then add \(3\), or add \(7\) and \(3\) first and then add \(4\), the result will be the same.