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:

Let
and
be, respectively, the length and the width of the rectangle.
If the length is 4 inches more than the width, we have

Moreover, the perimeter of a rectangle is given by

And we can substitute
to get

We know that the perimeter is 34 inches:

Which implies

Answer:
3/5 3/2
Step-by-step explanation:
6 Green and 9 Red