Final answer:
The helicopter is 300 ft above sea level while Submarine A is 350 ft below sea level, totaling 650 ft between them. Since the helicopter's detection range is 750 ft, it can indeed detect Submarine A.
Step-by-step explanation:
To determine if the helicopter can detect Submarine A, we need to calculate the distance between them. The helicopter is at 300 ft above sea level, and Submarine A is at -350 ft below sea level. To find the vertical distance between the helicopter and the submarine, we add their absolute distances from sea level:
Distance = 300 ft (helicopter's altitude) + 350 ft (submarine's depth)
Distance = 650 ft
Since the helicopter can detect submarines at a maximum distance of 750 ft, and the calculated distance is less than 750 ft, the helicopter can detect Submarine A.