I'm sort of confused. What is 1/x? I think it's the fraction thing but I'm not sure. Also how do you make mixed numbers on here?

Why are you confused??. x stands for ANY number. So, if x=2, then 1/x means: 1/2 =.50. If x=15, then 1/x means: 1/15 =0.06666667.......and so on.