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\begin{document}

\noindent
\vfil \noindent
\large
\hfil Math 120 A - Spring 2007 \hfil \pp
\hfil Mid-Term Exam Number Two\hfil  \pp
\hfil May 17, 2007 \hfil \pp
\hfil Answers \hfil \pp
\normalsize

Version A (problem 1 involves the time 5 AM)

\begin{enumerate}

\item 6.8376 hours
\item 32.8695 years after 1998
\item 95.801586 meters
\item 
\[
h(x) = \left\{ \begin{array}{ll}
				 -x & \mbox{if $x<0$} \\
				 3x-2 & \mbox{if $0 \le x \le 4$} \\
				 x  & \mbox{if $4< x <5$} \\
				 -6x & \mbox{if $x\ge 5$} 
				 \end{array}
				 \right.
\]
\end{enumerate}

Version B (problem 1 involves the time 6 AM)

\begin{enumerate}
\item 6.14498 hours
\item 24.231 years after 1998
\item 159.1676 meters
\item 
\[
h(x) = \left\{ \begin{array}{ll}
				 x & \mbox{if $x<1$} \\
				 4x+1 & \mbox{if $1 \le x \le 3$} \\
				 8x  & \mbox{if $3 < x <6$} \\
				 -2x & \mbox{if $x\ge 6$} 
				 \end{array}
				 \right.
\]


\end{enumerate}


\end{document}


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