PLZ HELP WILL GIVE BRAINLIEST

Answer:
-9/10 or final option.
Step-by-step explanation:
We first can see what [tex]\sqrt{\frac{81}{100} }[/tex] is.
Hint:
[tex]\sqrt{\frac{81}{100} }[/tex] is equivalent to square root 81 over the square root 100.
The square root of 81 = 9.
The square root of 100 = 10.
Now, we can put it back into a fraction as 9/10.
Remember! We aren't done yet. We have to include our negative. Also, because it is outside the radical, we add it at the very end.
So our answer is -9/10 or the final option.