Let
x--------> the time in minutes
y-------> an altitude in feet
we know that
For x=0 min y=0 ft
For x=50 min y=52,000 ft
so
the rate of change is equal to calculate the slope of the linear equation
[tex]\frac{52,000-0}{50-0}=\frac{52,000}{50}=1,040\frac{ft}{min}[/tex]
Round to the nearest hundred-------->[tex]1,000\frac{ft}{min}[/tex]
therefore
the answer is
[tex]1,000\frac{ft}{min}[/tex]