what is the difference in elevation

Question

Ojos del Salado is the highest mountain in Chile, with a peak at about 6900 meters above sea level. The Atacama Trench, just off the coast of Peru and Chile, is about 8100 meters below sea level (at its lowest point).

Answer 1

Hi Q.W.,

What is the difficulty here? You are going from +6900 m to -8100 m. Subtract one value from the other, then take the absolute value of your difference (b/c the problem doesn't ask for a *change*, which would be a signed value, but rather for the *difference*, which is a positive number).

-- Cheers, -- Mr. d.