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It is 16 because 4*4 = 16
16
x can be any number greater than 16 and less than 81.
False. Only a square number greater than 1 is always bigger than its root. For example, the root of 16 is 4, but the root of 1/16 (0.0625) is 1/4 (0.25) and the square root of 1 is 1.
16