Answer
Constant
Work Step by Step
To find out whether a rate of change is constant, divide the change in the dependent variable (elevation) by the change in the independent variable (time).
In this case, the calculation is the following:
2 minutes
30000-29000=1000
$\frac{1000}{2}=500$
5 minutes
30000-27500=2500
$\frac{2500}{5}=500$
12 minutes
30000-24000=6000
$\frac{6000}{5}=500$
Hence, the rate of change (500ft per minute) remains the same, so it is constant.
