I need help with this! It has several parts before actually finishing the original question. I am trying to understand the process in order to explain it to my son. An airplane cuts through the morning sky. For every 1,000 feet that it climbs, the outside temperature drops 20 degrees Fahrenheit.

Part A
Write the change in elevation and the change in temperature as rational numbers. (Explain please)

Part B
Write a numerical expression to represent the rate of temperature change in degrees Fahrenheit per foot. (Please explain, and if possible tell me how to show this as a fraction.)

Part C
What is the rate of temperature change in degrees Fahrenheit per foot? (Please explain )

Part D
Now, consider the reverse situation: as the airplane descends, or drops, 1,000 feet in the air, the temperature rises 20 degrees Fahrenheit. Write a numerical expression representing the rate of temperature change in degrees Fahrenheit per foot.

Part E
What is the rate of temperature change in degrees Fahrenheit per foot?

Part F
How is the rate you found in part E related to the rate you found in part C? What does this mean?