Help me please, I really need to complete this.

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 can you determine about the solutions of this system

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function