Answer:
Your answer is -110 feet, or 110 feet below sea level.
Step-by-step explanation:
depth of 233 feet below sea level = -233 [feet]
rises 73 feet = +73
comes up another 40 feet = +40
Equation:
- 233 + 73 + 40 = ?
|______|
-150 + 40 = ?
|_______|
-110 = ?
So the grey whale is feeding at -110 feet, 110 feet below sea level.
I hope this helps!