Final answer:
City C is 22,815 feet higher than City B, determined by adding the elevation of City C above sea level to the absolute elevation of City B below sea level.
Step-by-step explanation:
To determine how much higher City C is than City B, we need to calculate the difference in elevation between the two.
City C is at an elevation of 4008 feet above sea level, while City B is at an elevation of 18,807 feet below sea level.
To find the elevation difference, we add the absolute values of their elevations because one city is below sea level while the other is above. Therefore, the elevation difference is:
|4008 feet| + |-18,807 feet| = 4008 feet + 18,807 feet = 22,815 feet.
So, City C is 22,815 feet higher than City B.