Answer:
The diagram reprents the 3 sets and the universal set . The shaded portion clearly can be seen as :

Shaded region = 
Try to understand some what complex
The most appropriate choice for square root will be given by-
lies between 3 and 4
What is square root of a number?
Number raised to the power
is the square root of the number.
Here

3.464 lies between 3 and 4
lies between 3 and 4
To learn more about square root of a number, refer to the link:
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Simplify the radical by breaking the radicand up into a product of known factors in other words take the cube root of 27 then for the exponent 9 you divide by 3 get
3x^3