For a triangle with vertices X (-1,2) Y (10,-5) Z (4,-8), the midpoint of the shortest side is:

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?