\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=0.7cm,y=0.7cm]
\begin{axis}[
x=0.7cm,y=0.7cm,
axis lines=middle,
ymajorgrids=true,
xmajorgrids=true,
xmin=-1.52312282477653,
xmax=9.670722899310741,
ymin=-1.7284161124250574,
ymax=4.642720863100134,
xtick={-1.0,0.0,...,9.0},
ytick={-1.0,0.0,...,4.0},]
\clip(-1.52312282477653,-1.7284161124250574) rectangle (9.670722899310741,4.642720863100134);
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=-1.0:2.0)] plot (\x,{(0.026*(\x)^3+0.032*(\x)^2+-0.444*(\x)+0.55)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=2.0:4.0)] plot (\x,{(0.0*(\x)^3+0.25*(\x)^2+-1.0*(\x)+1.0)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=4.0:5.0)] plot (\x,{(-0.8*(\x)^3+11.4*(\x)^2+-51.8*(\x)+77.0)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=5.0:6.0)] plot (\x,{(0.2*(\x)^3+-4.4*(\x)^2+31.2*(\x)+-68.0)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=6.0:7.0)] plot (\x,{(0.11*(\x)^3+-3.09*(\x)^2+25.2*(\x)+-59.72)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=7.0:8.0)] plot (\x,{(0.03*(\x)^3+-0.77*(\x)^2+4.48*(\x)+-0.92)/1.0}););
\draw [samples=50,rotate around={0.:(0.,0.)},xshift=0.cm,yshift=0.cm,line width=1.pt,domain=8.0:9.0)] plot (\x,{(-0.38*(\x)^3+9.58*(\x)^2+-82.4*(\x)+241.64)/1.0}););

\draw (-0.8779443968752464,1.9168420052172042) node[anchor=north west] {$C_f$};
\end{axis}
\end{tikzpicture}