Question

A submarine is traveling at a depth of 152 feet below sea level. The submarine was given instructions to rise 63 feet and then drop 84 feet.

Answer 1

It started at 152 feet below sea level( or -152 feet), then was instructed to rise 63 feet. That would bring it to 89 feet. Then to fall 84 would leave it at 173 feet below sea level(or -173 feet)