Final answer:
Susan's change in altitude was calculated by multiplying her descent rate of 380 feet per minute by the duration of 3 minutes, resulting in a total descent of 1140 feet.
Step-by-step explanation:
To calculate Susan's change in altitude, we will multiply the rate of her descent by the time she descended. Susan descended at a rate of 380 feet per minute for 3 minutes. The change in altitude is found by the following calculation:
Change in altitude = Rate of descent × Time = 380 feet/minute × 3 minutes = 1140 feet.
Therefore, Susan's change in altitude is 1140 feet, which corresponds to option (a).