Question

Which equations illustrate the associative property of addition?



Choose exactly two answers that are correct.



A.


(11 + 2.2) + (–5) = 11 + [2.2 + (–5)]


B.


–3 • (5 + 8.5) = –3 • 5 + (–3) • 8.5


C.


3/4 + 1.8 = 1.8 + 3/4


D.


–7 + [4 + (–2.1 • 6)] = (–7 + 4) + (–2.1 • 6)

Answer 1

i think C and A

Answer 2

i mean C and D

Answer 3

associative means "put parens around"
you can change the parens when adding numbers
(1+2)+3 gives the same answer as 1 + (2+3)

Answer 4

so D and A

Answer 5

yes.

C shows "commutative" which is fancy for change the order.