Whats the length of A, B and C

Which statement best describes the polynomial

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 rate of change of a line that passes through (2,-5) and (6,-2)?