Answer:
The Awnser is B
Step-by-step explanation:
15 round by the nearest 10 is 20.
That's the associative property of addition
it is normally written as
(a+b)+c=a+(b+c)
which is like what you have
(17+4)+9=17+(4+9)
Answer:
I think your answer would be C I am not sure the way I worked it out says C. I hope this helps you out.