Hey!
For 6, I got C because you wouldn't do 15-3 first because you have to follow PEMDAS, so multiplying -3 to x and 2 would come first.
so it would be 15-3x-6
and now you simplify
-3x + 9
or 9-3x
Hope this helps!
(If you are the same person who asked for 10 and 13 as well, just tell me because I was trying to answer you question but it deleted and I copied the answer I wrote!)
