xelatex.tex

\documentclass{beamer}
  \usetheme{fibeamer}
  \usepackage{polyglossia}
  \setmainlanguage{english}
  \usepackage{amsmath}   % `\equation`s
  \usepackage{tabularx}  % Tables
  \usepackage{booktabs}
\begin{document}
  \title{My Presentation}
  \subtitle{Daring the Unknown}
  \author{Jane Doe}
  \frame{\maketitle}

  \begin{frame}{Foo}{bar}
    Hello world!
    \begin{equation}
      \tag{Mass--energy equivalence} e=mc^2
    \end{equation}
    \begin{center}
      \begin{tabularx}{\textwidth}{lllX}
      \toprule
      Day & Min Temp & Max Temp & Summary \\
      \midrule
      Monday & $11^{\circ}\mathsf{C}$ & $22^\circ\mathsf{C}$ & A
      clear day with lots of sunshine. However, the strong breeze
      will bring down the temperatures. \\
      \bottomrule
      \end{tabularx}
    \end{center}
  \end{frame}
\end{document}