Answers;
Associative Property of Addition
Step-by-step explanation
Associative property states that " the sum of three or more numbers remains the same regardless of how the numbers are grouped"
Let A, B and C be any three nummbers. According to associative property;
(A + B) + C = A + (B + C)
From the expression given
(3 + 12) + 25 = 3 + (12 + 25)
We can see that the sum of the numbers are the same regardless the grouping. And since this does not affect the result on both sides, hence the expression is an Associative Property of Addition