Miranda simplified an expression using the steps below:

Question

1. 43 + (57 + 69)
2. (43+57) +69
3. 100 + 69
4. 169

Which property makes step 1 and step 2 equivalent expressions?
A. Associative Property of Addition
B. Commutative Property of Addition
C. Identity Property of Addition
D. Inverse Property of Addition

I think its A

Answer 1

So do I :)

Answer 2

Ok thank you!

Answer 3

You are welcome. By the way:
https://www.mathsisfun.com/definitions/associative-law.html

Answer 4

Oh, that was very useful! Thanks again!