Another expression for the given rational function is 
<h3>Indices expression</h3>
Given the rational function expressed as:
x = √rs
We can reconstruct the expression by writing it using exponents as shown;

Separate to have:

Hence another expression for the given rational function is 
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Wheres the graph top be able to help?
In this question, the thing that needs to be found is the number whose 20% would be 18. The information's required for getting to the solution are already provided in the question. based on those given information's, the answer can be deduced very easily.
Let us assume the unknown number to be = x
Then
(20/100) * x = 18
x/5 = 18
x = 18 * 5
= 90
so the unknown number in the question is 90. I hope the procedure is clear enough for you to understand.
5⇒(1,4),(3,2) where (orange,blue)
P= 2/36=1/18