In addition to the diagram which statement is necessary to prove that the two triangles are congruent by sas criterion

C.

Step-by-step explanation:

SAS is set up literally...meaning that the angle HAS to be between the 2 sides in question.  Sices AB and DF are congruent, the included angles are angle ABC and DFE, so the other side to make up SAS has to be right next to the angle.  Those sides are BC and EF.  Choice C.

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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