Question

Aminer started at 8 feet above sea level

and then traveled 23 feet straight down
into a mine shaft. What was the miner's
elevation after traveling down the mine
shaft?

Answer 1

-15 ft or 15 ft below sea level

Explanation:

He started at +8 ft.

Then he went 23 ft down, that is -23 ft.

8 ft + (-23 ft) = 8 ft - 23 ft = -15 ft

Answer: -15 ft