The answer is 25:1 or 25 to 1. They are the same thing thought.
So I'm not totally sure but I got -15.32
So sorry if it's wrong!!
Yes because they're the same
as you already know, we start off by doing a quick switcheroo on the variables, and then we solve for y to get the inverse,

and if you run a vertical line test on that expression, you'll find that it doesn't pass it, meaning is not a function.