Is there a diagram with this question?
No this is not a function because 4 is used twice on the y side
There are several ways to do this by converting<span> the percentage to a fraction </span><span>by placing thee expression </span><span>over </span><span /><span><span><span><span><span><span><span>100</span></span></span></span></span></span><span>100</span></span><span>. Percentage means out of 100 and it will look like this 170/100.
Reduced the expression. 17/10
or in whole number it is 1 17/10</span><span />
No 20.0000004 cannot be rational.