\documentclass{article}

\usepackage{fullpage,parskip}
\usepackage{amsmath,amssymb}
\usepackage{xcolor}

\newcommand{\XXX}{{\color{red} \textsf{\textbf{XXX}}}}

\begin{document}

\noindent
% fill in the XXXs below
{\Large CS054 Informal HW Induction \\ Name: \XXX \\ CAS ID: \XXX} \\[.5em]
% We encourage you to collaborate, but please list any other students
% you talked to about the homework. If you worked alone, please just
% remove the XXXs.
%
% NOTE: However much you work with other students, you must write your
% solution yourself.
Collaborators: \XXX

% Okay! Solve the problems below. please don't delete the problem
% statement after `\item` or the `enumerate' bracketing which provides
% the numbering. Make sure the `\clearpage` comes after your answer.

\begin{enumerate}

\item Briefly explain the difference between the tactics [destruct]
  and [induction].

  \textbf{Answer:} \XXX

  \clearpage

\item Translate your solution for \texttt{plus\_comm} into an informal
  proof. You don't need to reprove any lemmas informally. Don't just
  paraphrase the Coq tactics into English!

  \textbf{Theorem:} \XXX
  \\
  \textbf{Proof:} \XXX
  \clearpage

\item Write an informal proof of the following theorem, using the
  informal proof of \texttt{plus\_assoc} as a model.

  \textbf{Theorem:} \XXX
  \\
  \textbf{Proof:} \XXX

\end{enumerate}
\end{document}
