The area of a square piece of land in square units can be represented by the expression 9q4r8s6. What is the length of one side of the piece of land?

The side length is the square root of the area: √(9q⁴r⁸s⁶) = 3q²r⁴|s³|. The absolute value is needed because the principal square root is nonnegative, even if s is negative. So the side length is 3q²r⁴|s³| units, choice B.

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