What is the atmospheric pressure at the top of a 4.5 km high mountain if at the foot it is 745 mm Hg?

Before performing this task, you must remember: with an increase in altitude for every 10 meters, atmospheric pressure will drop by 1 mm Hg. Thus, we can determine how the pressure will change. To do this, run:

4500 ÷ 10 = 450 mm Hg

Now we know how many marks the pressure will drop, so we can calculate what it will be equal to at the foot of the mountain. Consequently,

745 – 450 = 295 mm Hg

This means that at the foot of the mountain the barometer will show 295 mm Hg. and none of the above answers are correct.