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{\LARGE{
\hfil Math 120 A, B Winter 2012 \hfil \pp
\hfil Mid-Term Exam Number One\hfil  \pp
\hfil January 26, 2012 \hfil \pp
\hfil Answers \hfil \pp
}}

There were two versions of the exam used.

\bigskip

{\Large{Version A}}

\bigskip

In version A, in problem 1, Molly starts from the point (3,4).

\begin{enumerate}

\item (a) $x=3-t, y=4- \frac{3}{4} t$ (b) $x=12-0.47453t, y=6-0.406745 t$

\item (a) 5 (b) $6x+3a-9$

\item 0.985669 hours

\item 4.1250819 hours

\end{enumerate}

\bigskip

{\Large{Version B}}

\bigskip

In version B, in problem 1, Molly starts from the point (-1,7).

\begin{enumerate}
\item (a) $x=-1+t, y=7-2t$ (b) $x=-1.046228t, y = 22-6.626115 t$

\item (a) 8 (b) $6x+3a-15$

\item 2.7967 hours

\item 3.163289 hours

\end{enumerate}

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