Can you get free nx cash for combat arms without doing surveys

Yes, you can. But the tricky part is finding sites that pay you a good amount of money for the time you spend. The best website, in my opinion, is nxforfree.com.
They have occasional NX giveaways and also, they have offers that give you points which you can then redeem for an NX card. The offers aren't surveys, they are stuff such as sign-up to this website and get paid $.50 or something like that. You can probably get a $10 card within an hour if you try. Good luck!