Are any of my answers correct? And you don't have to but if you mind could you tell me how to get the answer to these cause I have no idea

Are any of my answers correct And you dont have to but if you mind could you tell me how to get the answer to these cause I have no idea class=

Respuesta :

I think letter c is yes.
b and c are yes while a and d are not.
a function is when every input has exactly one output which is the case for b and c since every x value cuts the graph at exactly one point