Assuming your original expression was 3√(27x¹⁸), the answer is 9x⁹√(3).
We split up the radicand into perfect squares. Once we do, we take out the things that were squared:

multiply the whole number with the denominator then add the numerator over the denominator then find the common multiple.
Mean is average example
mean of x,y,z is (x+y+z)/3
so 6 values
mean of 28
that means that they add up to 168
median means the middle number when you arrange them
range means the distance from smallest number to largest number
an example
18,27,29,29,29,36
Answer:
-1 will be the answer.
hope this is helpful. ^_^
1. 3/10
2. 23/8
3. -5/1
4. 16/1
5. -7/4
6. 4 5/10
7. 3/1
8. 11/100