an airplane 30000 feet above the ground begins descending at a rate of 2000 feet per minute. write an equation to model the situation. find the altitude of the plane after 5 minutes.

A = 30,000 - 2000m    where A=altitude and m = number of minutes

After 5 minutes  A ( altitude) =  30,000 - 2000(5) = 20,000 feet