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the answer is definitly 0 (zero)!
2.
196 is a perfect square. Since the area of a square is equal to the square of the measure of the length of its side, the side length will be the square root of 196, which is 14 ft.
30 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
500 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.