Can someone PLEASE solve/grade 9 math

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?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Asinusoidal function whose frequency is 1/6pi