Question

11. Robert photographs a lush forest of sea fans after diving 40 feet in the Reefs of

Cozumel, just off Mexico’s Caribbean coast. He then rises 23 feet to swim over an
underwater mountain range in order to dive 19 feet to meet up with his brother,
Sam. Together they rise 31 feet to swim with a bale of Hawksbill sea turtles.
How far below sea level are they?

Answer 1

sea level is 0

robert dives 40 ft.....-40
he then rises 23 ft.....-40 + 23 = -17
he then dives 19 ft to meet Sam....-17 - 19 = -36
together they rise 31 ft...-36 + 31 = - 5

they are 5 ft below sea level <==