Amanda applied the associative property to (1 + 5) + 9 = 15. Which of the following might she have used? A) 1 + 5 + 3(2 + 1) = 15 B) 1 + (5 + 9) = 15 C) 5 + 1 + 9 = 15 D) 9 + 1 + 5 =15
The 9 has to be in in front of the brackets in order to tell us which operation we are using. If 1+5 is in brackets, then it would be D because y pi know what you are adding (1+5) to.
