This applet can be use to demonstrate the concept of Domain and range of a function.[br]Click on of of the buttons to select one of the three functions.[br]Drag the "domain" slider. A vertical ray will scan the viewing window and will project the intersection point with the function to the x-axis. The colored intervals on the x-axis form the domain of the function.[br]Drag the "range" slider. A horizontal ray will scan the vewing window and will project the intersecting points with the function over the y-Axis. The colored intervals on the y-axis form the range of the function.