What are the two main purposes of all businesses?

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?

Find the multiplicative inverse of 8-12i

Is this a polynomial function? i need to know asap