Final answer:
The submarine's new position is 460 feet above sea level. Initially, 100 feet below, it ascended 450 feet, descended 100 feet, and ascended 210 feet. The cumulative displacement brings it to a position 460 feet above sea level, considering the changes in depth relative to the initial position below sea level.
Step-by-step explanation:
The submarine's new position relative to sea level involves simple addition and subtraction to track the depth changes. Initially, the submarine is at -100 feet (below sea level). First, it ascends 450 feet, reaching 350 feet above sea level. Then, it descends 100 feet, moving to 250 feet above sea level. Lastly, it ascends another 210 feet, resulting in its new position being 460 feet above sea level. This comprehensive tracking of depth changes illustrates the submarine's final location relative to sea level.