\documentclass[11pt]{article}
\usepackage{mycommands}
\date{Due Tuesday, 2/19}
\title{Math 104 Homework 4 (Vaintrob)}
\author{}
\begin{document}
\maketitle
\section{Exercise 8.6}

\section{Exercise 8.8}

\section{Exercise 8.9}

\section{Exercise 8.10} 

\section{Exercise 9.1, 9.2}

\section{Exercise 10.1}

\end{document}