To find the pilot's rate of change in feet per minute while descending, you can use the formula:
\[ \text{Rate of Change} = \frac{\text{Total Change in Altitude}}{\text{Total Time}} \]
In this case, the total change in altitude is 3,000 feet (since the plane is descending, we'll consider this a negative change) and the total time is 4 minutes.
Calculating the rate:
\[ \text{Rate of Change} = \frac{-3000 \text{ feet}}{4 \text{ minutes}} = -750 \text{ feet per minute} \]
The negative sign indicates descent. Therefore, the pilot's rate of change is \(-750\) feet per minute.