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The range is the all the possible y-values for the function. f(x)=2-3x does not have any points where it is undefined because it is a linear function ( a line). The answer is all real numbers or (-infinity,infinity)
It is -12.8, -6.4, 0, 6.4 and 12.8
The domain can be anything you like: a single element, all real numbers, all complex numbers, etc.
fx=3x-5 f=(3x-5)/x f2=(6x-10)/x /=divide
If it were written in a book of some sort, fx or f(x) is read aloud as "f or x". "f" is a function of some variable, "x". By function it means something happens to x e.g. x2 or 3x+4.