The domain and inverse of the function
is
Domain =
,

What is a function?
A function from A to B is a rule that assigns to each element of A a unique element of B. A is called the domain of the function and B is called the codomain of the function.
There are different operations on functions like addition, subtraction, multiplication, division and composition of functions.
The given function is

r(x) is not defined if x - 4 = 0
r(x) is not defined for x = 4
Domain =
,
Where
is the set of all real number
Let r(x) = y

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Y=1/2x +0. You add the 2x to the other side, and then divide everything by 4 to have only 1y.
4 because 9×4=36 and now I need more characters
It's simply 4,2,0,-2..... the pattern is just subtracting two as you go on.
.75 is farthest because 2/3 is .66 (infinitely) and .25 is smaller than both