The inequality that represents the domain of the function is 
<h3>How to determine the domain?</h3>
The function is given as:

Set the radicand greater than or equal to 0

Multiply through by 2
x - 20 ≥ 0
Add 20 to both sides
x ≥ 20
Hence, the domain of the function is x ≥ 20
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3/2 We look for a number that goes into both 9 and 6 without leaving a remainder, and that number is 3
The correct answer is Undefined
I just did this in pre-calculus and I’m positive it is correct