The area of a square can be represented by the expression x10. Which monomial represents a side of the square?

The area of a square is side × side, so its side length is the square root of its area. The square root of x¹⁰ is x⁵, since x⁵ × x⁵ = x¹⁰. Therefore, the side is represented by x⁵, choice B.

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