Answer:
4,488 ft
Explanation:
Elevation means height. Drop means the decrease. Below sea level means the height will be negative. So you find the drop by subtracting the final position (-126 ft) from the starting position (4,362 ft).
4,362 ft - (-126 ft)
When you subtract a negative it is the same as adding a positive so...
4,362 ft + 126 ft = 4,488ft
So, there was a drop in elevation of 4,488 ft.