Find the slope of y=4

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

Equation for the calculation double 2 and then add 5

What additional information could be used to prove abc =mqr using sas? check all that apply.