C: Square-rooting
A number is a perfect square if it results from the product of two equal integers
Square roots of a number, x, are smaller numbers that multiply themselves to produce the larger number (x)
Since it is possible for us to find the square roots of all the perfect squares listed, they are closed under the square-rooting operation.
For example:
√1 = 1
√4 = 2
√9 = 3
√16 = 4
√25 = 5
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