Answer: The diver must need to rise 25.6 feet above the ground.
Explanation:
Given: A diver dives to a depth of –25.6 feet below sea level.
When he was at sea level , the distance will be 0.
Thus, to reach sea level he need to travel 0-(-25.6) feet=25.6 feet.
Therefore,if diver want to reach the sea level, he need to rise 25.6 feet above.
Hence, the diver must need to rise 25.6 feet above the ground.