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\documentclass[12pt]{exam}\usepackage{geometry} % See geometry.pdf to learn the layout options. There are lots.\geometry{letterpaper} % ... or a4paper or a5paper or ...%\geometry{landscape} % Activate for for rotated page geometry%\usepackage[parfill]{parskip} % Activate to begin paragraphs with an empty line rather than an indent\usepackage{graphicx}\usepackage{amssymb}\usepackage{multicol}\usepackage{amsmath}\usepackage{pst-plot}\usepackage{pstricks-add}\addpoints\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}\pagestyle{headandfoot}\firstpageheader{Section 2.6}{Precalculus}{Rational Functions and Their Graphs}\runningheader{Section 2.6}{Precalculus}{Rational Functions and Their Graphs}\firstpagefooter{}{}{}\begin{document}\fbox{\begin{tabular}{p{6in}}\end{tabular}}\paragraph{Example 1} Find the domain of each rational function:\begin{multicols}{3}\begin{parts}\part $f(x)=\dfrac{x^2-25}{x-5}$\part $g(x)=\dfrac{x}{x^2-25}$\part $h(x)=\dfrac{x+5}{x^2+25}$\end{parts}\end{multicols}\vspace{1in}\paragraph{Check Point 1}\begin{multicols}{3}{\begin{parts}\part $f(x)=\dfrac{5x}{x-4}$