Final answer:
The glacier's thickness after seven years would be 917 1/10 meters.
Step-by-step explanation:
To find the thickness of the glacier after seven years, we need to use the average rate of change of -22 7/10 m per year. This means that the glacier decreases in thickness by 22 7/10 meters every year.
After seven years, the glacier would have decreased in thickness by 7 times the average rate of change, which is 7 * 22 7/10 = 158 9/10 meters.
Therefore, the thickness of the glacier after seven years would be the initial thickness of 1076 meters minus 158 9/10 meters, which is equal to 917 1/10 meters.