Geometry math question no guessing and show work you

We can name an angle either by naming its vertex or by three letters , keeping the letter of vertex in between.

so here vertex is F

we can name it as ∠EFG, ∠F , ∠GFE

This strikes out the option B that is ∠G

so option B is the answer

no, x cannot be the same number. in all of them, x is 1. for one input there is another output. g is not a function

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