Observe the number line graph then practice defining it's set of values using Interval Notation.[br][br]1. Slide the [b][color=#ff0000]red pinheads[/color][/b] to select soft bracket (open circle for non-inclusive) or hard bracket [closed circle for inclusive][br][br]2. Slide the [b][color=#0000ff]blue[/color][/b] and [b][color=#6aa84f]green[/color][/b] pinheads to match the the x, y values with the number line graph. [br][br]3. Click the New Problem button each time you want to try again.