Lucy monitors the position of a large fish in the ocean with a depth finder. The device records the depth of the fish. Initially, the fish swims at a depth of 13.52 feet below sea level. Suddenly the fish rises 7.8 feet. (a) What expression represents the position of the fish relative to sea level after it rises 7.8 feet?
(b) What is the position of the fish after it rises 7.8 feet relative to sea level? Show your work. Answer in a complete sentence.