Explanation:
what did your teacher want to achieve by the 2 questions that have the same answer ? or is sea level different from the surface of that body of water ? that information would be missing.
the driver descends 15.2 ft per second =
= 15.2/1 ft/s = 15.2 ft/s
after 4.1 seconds the diver descends 15.2 × 4.1 = 62.32 ft.
so, the diver is at that time 62.32 ft under the surface of that body of water.
if sea level is different to the surface of that body of water, then that difference has to be added (when sea level is higher that the water surface) or subtracted (when sea level is below the water surface) to get the the position below or above sea level.