The different possible elevations of the city are :
- + 10 feets and - 10 feets
- The sea level position = 0
- Difference in elevation = 10
- The difference in elevation could either be below sea level or above sea level.
The distance above sea level :
- Positive elevation = + 10 feets
The distance below sea level :
- Negative elevation = - 10 feets
Therefore, the two elevations the city could have are +10 feets and - 10 feets
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