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\begin{document}
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% Header %
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\fancyhead{}
\fancyfoot{}
\lhead{\large \textbf{Math H104}}
\chead{\Large \textbf{Homework X}}
\rhead{\large \textbf{Your Name}}
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% Document %
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\begin{enumerate}
\item This is the first exercise.
\item This is the second exercise, which has multiple parts.
\begin{enumerate}
\item Here is the first part.
\item And here is the second part.
\end{enumerate}
\end{enumerate}
\end{document}