To find the rate of change in the plane's altitude, we can use the formula for rate of change, which is:
\[ \text{Rate of Change} = \frac{\text{Change in Altitude}}{\text{Change in Time}} \]
In this case:
- The change in altitude is \(-4000\) feet (since the plane is descending, we use a negative sign).
- The change in time is \(3.5\) minutes.
Now we calculate the quotient:
\[ \text{Rate of Change} = \frac{-4000 \text{ feet}}{3.5 \text{ minutes}} \]
Calculating this gives:
\[ \text{Rate of Change} = -1142.8571 \text{ feet per minute} \]
Rounding this to the nearest hundredth, we get:
\[ \text{Rate of Change} \approx -1142.86 \text{ feet per minute} \]
Thus, the rate of change in the plane’s altitude is approximately \(-1142.86\) feet per minute, indicating the plane is descending at this rate.