Answer: The difference between these two elevations is 15207 ft.
Explanation:
Since we have given that
Altitude of the top of a mountain in California from sea level = 14925 ft
Bottom of death valley below the sea level = 282 ft
Since Mountain is above the sea level so, it is expressed with positive sign as
(+)14925 ft
Death valley is below the sea level so, it is expressed with negative sign as (-)282 ft
So, difference between these two elevations is given by

Hence, the difference between these two elevations is 15207 ft.