How can you graph negative fractions on a number line

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

Will give brainliest summations with algebraic expressions image shown

The quadratic function h(t)=-16.1t^2+150 choose the graph representation