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Answer:
A. The new weight room has an area of 480ft^2
Explanation:
Area of gym = 4x^2
Area of weight room = 480
Area of gym + weight room = 4x^2 + 480
480 is a constant because its value cannot and will not change whereas x is an unknown
The answer is A. The new weight room has an area of 480 ft.
Since the area of the gym is 4x^2, they are adding 480 ft^2, which is the area of the new weight room.
Hope this helps!