I needdd helpp :)

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

Which of the following is true for the relation f(x)=2x^2+1

If y varies directly as x2 and y=6 when x=6, find the constant of variation.