a diver is at an elevation of 23 feet from sea level he descends another 25 feet how many feet does the driver need to ascend to reach sea level
The diver is currently at 23 feet above sea level. When he descends another 25 feet, he will be at a depth of 23 - 25 = -2 feet.
To reach sea level from -2 feet, the diver needs to ascend 2 feet.