doccover.tex

\documentclass{article}
\usepackage{background}
\usepackage{pgfplots}
\usepackage{geometry}


\SetBgColor{gray}
\SetBgContents{%
		\begin{tikzpicture}
			\begin{axis}[
                    width=10cm,
					axis x line=middle,
					axis y line=middle,
					line width=1pt,
                    color=gray!40,
					tick label style={font=\tiny},
				xmin=-3,xmax=5,
				ymin=-5,ymax=3,
				xlabel={$x$},
				ylabel={$y$},
				grid=major,
				xtick={-3,...,5},
				ytick={-5,...,3},
				]
				\addplot[red!40,<->,>=stealth]expression[domain=-2:4,samples=100]{-(1/2)^x};
			\end{axis}
		\end{tikzpicture}
}
\SetBgScale{4.5}
\SetBgAngle{30}
%\SetBgPosition{current page.north}
\SetBgPosition{5cm,-13cm}

\begin{document}

\pagestyle{empty}
\begin{center}
    \Huge
    %\sffamily
    \bfseries MATH 111 \& 112 document

    \vspace{14cm}
    A document for the students of PCC.
\end{center}
\end{document}