Pls ! it's 2: 30am here and this is due at 7: 30 pls ! i also need explanation of how to do this cuz idk how to

7) $90-11=79$

8) $180-92=78$

9) $90-56=34$

wth is with the little mtn top and what are you talking about like fix your words and accually make sence with them and i like was in a completly different question like three times like it seems like your ilitteret