After traveling for 4 hours and 1800 miles, an airplane begins a steady descent. When it begins descending, its altitude (height) is 33,000 feet. After 8 minutes, it is at
17,000 feet.
Answer the questions to write a function that models the plane's altitude.

1. How quickly does the airplane descend? In other words, what is the rate of change
of the plane's altitude? Show your work.
Write your answer in the space below.