Help pls quiz pls help

Abcd is a parallelogram find the valuse of x

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 are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)