What is f(x) and how do you get f(7)

I’m not sure what you mean but here’s what I think:

• f(x) is basically another use for “y”.
• f(7): 7 is the “x” variable that is put into the equation. Because the original form is “f(x)”, we know that with 7 in place of “x”, 7=x.

Ibelieve the answer is c