Help please I have like 20 minutes to complete this

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.