\documentclass[12pt]{article}
\usepackage{amsmath,amssymb,graphicx,txfonts,multicol,picins}
\usepackage[setpagesize=false]{hyperref}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage[setpagesize=false]{hyperref}\hypersetup{colorlinks,
  linkcolor={blue!50!black},
  citecolor={blue!50!black},
  urlcolor=blue
}

\paperwidth 8in
\paperheight 10.5in
\textwidth 8in
\textheight 10.5in
\oddsidemargin -0.75in
\evensidemargin \oddsidemargin
\topmargin -0.75in
\headheight 0in
\headsep 0in
\footskip 0in
\parindent 0in
\setlength{\topsep}{0pt}
\pagestyle{empty}

\def\myurl{http://www.math.toronto.edu/~drorbn/}

\def\bbC{{\mathbb C}}
\def\bbF{{\mathbb F}}
\def\bbN{{\mathbb N}}
\def\bbQ{{\mathbb Q}}
\def\bbR{{\mathbb R}}
\def\bbZ{{\mathbb Z}}

\def\imagetop#1{\vtop{\null\hbox{#1}}}

\begin{document}

Name (Last, First): $\underline{\hspace{3in}}$ \hfill Student ID: $\underline{\hspace{2in}}$

\vskip 2mm

{\small
  \href{\myurl}{Dror Bar-Natan}:
  \href{\myurl/classes/}{Classes}:
  \href{\myurl/classes/\#1516}{2015-16}:
  \href{\myurl/classes/16-475-ProblemSolving}{MAT 475 Problem Solving Seminar}:
  \hfill\url{http://drorbn.net/16-475}
}

\vskip 3mm

{\large\bf Quiz 7} on March 10, 2016: ``Divide into Cases''. You have 30 minutes to solve as much as you can of the following two problems. Please write on both sides of the page. \hfill {\bf Good Luck!}

\vskip 2mm

\noindent{\bf Problem 1 (Larson's 1.7.8)}. Determine $F(x)$, if for all real $x$ and $y$, $F(x)F(y)-F(xy)=x+y$.

\noindent{\bf Problem 2 (Larson's 2.5.11a).} Let $R_n$ denote the number of ways of placing $n$ nonattacking rooks on an $n\times n$ chessboard so that the resulting arrangement is symmetric about a $90^\circ$ clockwise rotation of the board about its centre. Show that if $k$ is a natural number, then $R_{4k}=(4k-2)R_{4k-4}$, and $R_{4k+1}=R_{4k}$, and $R_{4k+2}=R_{4k+3}=0$.

\end{document}