Compare solving multi step inequalities and solving multi step equations

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

We just started the introduction into circles and i have no idea how to do this.