what is- a+(b+12)=(b+12+a what is the property?

Question

 im in 7th grade and im stuck on this problem do you think you can help?

 

Answer 1

a  + (b + 12) = (b + 12) + a 

 

That is the commutative property of addition.

 

(b + 12) + a = b + (12 + a)

 

That is the associative property of addition.