Please help i'm really stuck on this! thank you :)

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?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

If chord ab is congruent to chord cd, then what must be true about ef and eg?