Question

Mt. McKinley, which is the highest elevation in North America, is 20,320 feet above sea level. Death Valley, which is the lowest elevation in North America, is 282 feet below sea level. What is the difference in height between the top of Mt. McKinley and the bottom of death valley?

Answer 1

20,320 + Ι-282Ι = 20,602
The vertical lines indicate absolute value, or the distance from sea level.