Final answer:
The equation (3+8)+10=3+(8+10) demonstrates the Associative Property of Addition, which indicates that the sum remains the same regardless of how numbers are grouped in addition.
Step-by-step explanation:
The property shown in the equation (3+8)+10=3+(8+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 affect the sum. Essentially, it doesn't matter how we group the numbers when we're adding; we'll get the same result. This example shows that whether you group 3 and 8 together first, and then add 10, or you add 8 and 10 together first, and then add 3, the total sum remains unchanged.