Answer:
14557 feet
Explanation:
The sea level is considered to be zero, so that elevation is positive while depth is negative.
Mt. Whitney is 14,505 feet above sea level.
Salton Sea is -52 feet below sea level.
Difference = Mt. Whitney elevation - Salton Sea depth
= 14505 - (-52)
= 14505 + 52
= 14557
Difference = 14557 feet
The difference between Mt. Whitney and Salton Sea is 14557 feet.