Answer: True
Step-by-step explanation: The statement (5 + 12) + 4 = 5 + (12 + 4) represents the Associative Property of Addition.
Notice that the addends, or the numbers we're adding, are the same on both sides of the equals sign. However, the numbers are grouped differently inside the parentheses.
If you do the math out, you will see that both sides equal 21.
The Associative Property of Addition says that when we're adding more than two numbers, the grouping of the addends does not change the sum.