Answer :
[tex]\begin{gathered} \text{If winston is 27.77 and sally is 2.10 meters deper, then sally is } \\ S=27.77+2.10 \\ S=29.87 \\ \\ \text{Sally is 29.87 metters below the surface of the ocean} \end{gathered}[/tex]
The elevation of sally is -29.87