Draw the graphs of

,  and 




Draw vertical lines at the cut-off places -3, 3, 9, and 11

,  and 

  

Erase the graph of y=1 (the red one) everywhere except between x=-3 and 3, the first two vertical lines.

Erase the graph of y=|x| (the green one) everywhere except between x=3 and 9, the next two vertical lines.

Erase the graph of y=√x (the blue one) everywhere except between x=9 and 11, the last two vertical lines.



Erase the vertical cut-off lines, and put darkened or open circles at the
end points of each piece of the graph to indicate whether they are included or not:



Edwin