A diver begins at sea level and dives down 200 feet. He ascends at a steady rate of 12 1 3 feet per minute for 4. 5 minutes. This depth is represented by the numerical expression: -200 12 1 3 (4. 5) Simplify the expression using the order of operations. What is the diver’s depth? -200 37 3 (4. 5) -200 55. 5 feet.