cover.tex

\documentclass{article}
\usepackage{graphicx}
\begin{document}

\begin{center}
{\bf\Huge Prime Numbers and the}
\vspace{1em}

{\bf\Huge Riemann Hypothesis}

\vspace{1em}

\includegraphics[width=.9\textwidth]{zeta.pdf}

\vspace{1em}

\includegraphics[width=.3\textwidth]{riemann.jpg}

\vspace{1em}

\includegraphics[width=.9\textwidth]{theta.pdf}
\end{center}

\end{document}