Answer:
[tex]\sqrt{x}-9[/tex]
Step-by-step explanation:
Let's break it down. There is..
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A square root of a number: [tex]\sqrt{x}[/tex] (assuming "the number" is [tex]x[/tex]).
And they say that 9 is less than that, so we subtract 9 from [tex]\sqrt{x}[/tex], which gives us [tex]\sqrt{x}-9[/tex].
I hope that helps! :)