A submarine to study changes in the sea level of the Pacific Ocean descends 420 feet below sea level. Three hours later, it makes an ascent of 170 feet. What is the submarine's new position?

Ovid, a famous Roman poet was born in 43 B.C. and died in 17 A.D. How long did he live?

The airport in Kazakhstan is situated 72 feet below sea level. The airport in Amsterdam is located 13 feet below sea level. What is the difference in elevation between the two airports?

A group of hikers began their trek 115 feet below sea level. they complete their hike at 2,640 feet above sea level. What is the distance they trekked in total?

Mt. Everest, the highest elevation in Asia, is 29,028 feet above sea level. The Dead Sea, the lowest elevation, is 1,312 feet below sea level. What is the difference between these two elevations?

A submarine was situated 800 feet below sea level. If it ascends 250 feet, what is it's new position?

A roller coaster begins at 90 feet above ground level. It descends 105 feet. Find the height of the coaster after the first descent. 

On the first play, the football team lost 6 yards. On the second play, the team lost 5 yards. What was their total change in yards?