Adolphin is 9 below the surface of the ocean. if it’s position can be recorded as -9 what word the position of 0 represent?

0 represents the surface of the ocean

Step-by-step explanation: Words like 'below' indicate a negative number. Since the dolfin's positions is -9 below the sea level, the equation x-9=-9 can be created (let x = ocean surface level). Add 9 to both sides to cancel out -9 on the left side and isolate x. You have x = 0, so the ocean surface is 0.

Of course, you don't have to do all that! That was a in-depth explanation. Just make sure to look at the wording :P