Question

A drone takes off from the base of a mountain at a height of 27 ft below sea level. the drone then flies up 642 ft before landing at the top of the mountain. how tall is the mountain

Answer 1

The tall is the difference between the highest and the lowest point.

In this case:

h = 642 ft - ( - 27 ft ) = 642 ft + 27 ft = 669 ft