What’s the answer?

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b?