Answer:
520 ft² represented the area of the weight room .
Option (C) is correct .
Explanation:
As given
A rectangular gym has an area of 4x² ft² .
The school decides to add a new weight room.
The total area of the gym and the weight room is (4x² + 520) ft².
As new weight room is added to the gym .
Thus 520 ft² represented the area of the weight room .
Option (C) is correct .