20 points use the associative property of addition to find the total of 4, 12, and 18 in two different ways. a. (4 + 12) + 18 = 16 + 18 = 34; 4 + (12 + 18) = 4 + 30 = 34 b. (4 + 12) + 18 = 16 + 18 = 34; (12 + 4) + 18 = 16 + 18 = 34 c. 4 + 12 + 18 = 16 + 18 = 34; 12 + 18 + 4 = 30 + 4 = 34 d. 4 + 12 + 18 = 16 + 18 = 34; 18 + 12 + 4 = 30 + 4 = 34

Hello! Associative property has to do with having parenthesis around two numbers, without the order of the numbers lined up changing. Only the parenthesis moves. In this case, C and D are eliminated. B makes sense, but the order of numbers in the second way changes. For A, it never changes. Only the parenthesis change. Therefore, the answer is A.

 the answer is 28 :)