The penguin starts at 21 feet below sea level, which is represented as -21 feet. After swimming up 9 feet, we can calculate its new position by adding 9 feet to -21 feet:
\[ -21 + 9 = -12 \]
Thus, the penguin is now 12 feet below sea level.
The position of the penguin now relative to sea level is -12 feet.
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