\documentclass[12pt]{article}
% comments are denoted by percent signs
\usepackage[paper=letterpaper,
  left=1in,
  right=1in,
  top=1in,
  bottom=1in]{geometry}

\usepackage[parfill]{parskip}
\pagestyle{empty}
\usepackage{amssymb}

\begin{document}

\begin{center}
{\large CS 191}\\
\LaTeX\ Lab 0
\end{center}

\begin{flushright}
Your name\\
Your Truman username\\
Date
\end{flushright}

Hello, world!

% The backslashed square brackets are a shortcut for
% \begin{displaymath}   stuff goes here    \end{displaymath}
\[
  x^2 = (2k)^2 = 4k^2 = 2(2k^2)
\]

This is my first \LaTeX\ document.

\end{document}
