F(x)=x+4 This is the equation written in the function notation with x as the independent variable
I'm pretty sure this is correct, but it depends on how ur teacher wants it to be written like.
So we have 0.1777777...
let x=0.1777...
then 100x=17.7777 and 10x=1.7777 upon subtraction of the 10x from 100x you get:
100x-10x=17.777-1.777
90x=16
x=16/90
x=8/45