What Are Intervals?Menu1DefinitionInterval on a Number LineActivity Set 1Is the number x included in the interval?CheckResetContinue2Intervals as InequalitiesActivity Set 13Interval Notation Using Square Brackets and ParenthesesActivity Set 14Open IntervalsActivity Set 15Closed IntervalsActivity Set 16Half-open IntervalsActivity Set 17Union of IntervalsActivity Set 18Intersection of IntervalsActivity Set 19Boss Battle