Asubmarine 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.

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)

The lateral side of a triangular pyramid is a triangle. in order to increase the lateral surface area, the slant height and the height should be altered