Final answer:
The question concerns the descent of an airplane represented by a cubic equation and involves concepts such as slope, wind velocity, and projectile motion. It is primarily related to Mathematics and Physics, particularly focusing on velocity, acceleration, and an object's path in motion. Information on the specific cubic equation would be needed for a more targeted answer.
Step-by-step explanation:
The question provided pertains to the descent of an airplane and how its glide path is represented by the cubic equation, and it also mentions the calculation of a slope based on given points. While the question touches on various concepts, including the impact of air density on altitude and a pilot needing to account for wind velocity when directing the plane, it seems the majority of information provided does not directly pertain to the primary question asked about the cubic equation of the airplane's descent. However, the latter part of the information discusses projectile motion and the deceleration of a plane after landing which is more relevant, as both are concerned with Physics concepts such as velocity, time, acceleration, and the path of an object in motion. It would be most helpful to have the actual cubic equation to specifically answer the question about the airplane's glide path. That being said, we can still discuss the concepts of glide path and how a cubic function might represent it.