A submarine is exploring the Pacific Ocean. At 502.5 feet below sea level, the water temperature is °F. The submarine dives down 115 feet deeper, and the water temperature drops by °F. What were the elevation and the water temperature after the submarine dove? Assume that sea level is at 0 feet of elevation. Complete the steps below to solve the problem. Which operation must you use to find the water temperature after the submarine’s final dive? Which word or words in the problem signify this operation?