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The vertex is at the origin of coordinates ... the point (0, 0).
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fx=3x-5 f=(3x-5)/x f2=(6x-10)/x /=divide
It depends on whether fx denotes frequency times variable value or the probability generating function for the variable x.
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.