Question

Which equation is a function of x? 20 POINTS!!! QUICK PLEASE!

Answer 1

Answer:

c

Step-by-step explanation:

Answer 2

A function of x means that you get an answer if you plug in a certain value for x.

A is not a function, because it specifies that x=5
B could be a function, but you'd have to rewrite it in a form y = ....
C is a nice function of x. Just swap it: y=x2
D is a circle. You can't rewrite it as a clean function of x. 

So I would choose C.