Final answer:
The equation (9 + 4) + 10 = 9 + (4 + 10) demonstrates the Associative Property of Addition, which explains that the sum of numbers remains the same regardless of how they are grouped when being added.
Step-by-step explanation:
The property shown in the equation (9 + 4) + 10 = 9 + (4 + 10) is the Associative Property of Addition. This property states that when three or more numbers are added, the way in which they are grouped does not change the sum. The equation demonstrates that whether you add 4 to 9 first, and then add 10, or add 4 to 10 first, and then add this sum to 9, the result will be the same.
For example, following the associative property, if we have three numbers A, B, and C, the grouping can be altered: (A + B) + C = A + (B + C), and the sum remains consistent regardless of the grouping.