Determine whether the rate of change is constant. if it is, find the rate of change

Determine whether the rate of change is constant. if it is, find the rate of change and explain what it represents
0
4
7
airplane descent
time (min) elevation (ft)
50.000
47,600
45,800
17
39,800
deleggine whether the rate of change is constant. choose the correct answer below.
o a. no, the rate of change is not constant.
b. yes, the rate of change is constant and it equals 1m
300 ft
600 ft
c. yes, the rate of change is constant and it equals -
300 ft
d. yes, the rate of change is constant and it equals - i min
now explain what the rate of change represents choose the correct answer below
a it represents the number of feet the airplane descends per minute
b. it represents the speed of the airplane