This document discusses rational functions and how to find their asymptotes. It defines a rational function as a function of the form f(x)=p(x)/q(x) where p and q are polynomials. It then explains that vertical asymptotes occur where the denominator equals 0, and how to determine if there is a horizontal or oblique asymptote based on comparing the degrees of the numerator and denominator polynomials. Specifically, if the degree of the numerator is less than the denominator, the horizontal asymptote is the x-axis; if they are equal, the horizontal asymptote is y=leading coefficient of the numerator/leading coefficient of the denominator; and if the numerator degree is greater, there is an oblique asymptote