Respuesta :

Answer:

The answers are the top and bottom lines.

Step-by-step explanation:

For functions, there should be one y value corresponding to each x.  The three lines in the middle all have  more than one value for each x.

Answer:

the 2 lines representing a parabola at the top and a straight line at the bottom.

Step-by-step explanation:

parabola and straight line are valid functions while S-curve, half- and full circle are not.

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