A mountain is 12 comma 626 feet above sea​ level, and a valley is 335 feet below sea level. What is the difference in elevation between the mountain and the​ valley?

The elevation of the mountain is 12,626 feet above sea level and the elevation of the valley is 335 feet below sea level.

To find the difference in elevation between the mountain and the valley, we need to add the two elevations together:

12,626 feet + 335 feet = 12,961 feet

So, the difference in elevation between the mountain and the valley is 12,961 feet.