Final answer:
After 7 minutes of descent at 2,000 feet per minute, the plane would have travelled 14,000 feet, and the change in altitude would be -14,000 feet.
Step-by-step explanation:
Mozart is flying an airplane and descending at a rate of 2,000 feet per minute. To find out how far the plane has travelled after 7 minutes, we can use the formula for distance travelled, which is the rate of descent multiplied by the time. Therefore, the distance travelled after 7 minutes would be 2,000 feet/minute * 7 minutes = 14,000 feet.
Since he is descending, the change in altitude is negative. So the change in altitude would be -14,000 feet, indicating that the altitude has decreased by that amount.