\input epsf
\nopagenumbers
\magnification=\magstep1

\noindent {\bf Problem statement} Suppose $f(x)=
\sqrt{{x\over{4-x}}}$.

\medskip

\noindent a) Find the graph of $y=f(x)$ in the window $-5\le x\le 5$ and $0\le
y\le 10$. 

\medskip

\noindent b) What is the domain of $f$? Verify your statement.

\medskip

\noindent c) Solve $y=f(x)$ for $x$. What is the range of $f$? Your
expression for $x$ in terms of $y$ may help to verify your statement.

\vfil\eject\end

