This math topic focuses on the understanding and interpretation of domain and range in the context of functions. Students practice converting set builder notation descriptions of domains and ranges into graphical representations on a number line, some including union cases. The problems require identifying the correct number line that matches a given set builder notation, ensuring comprehension of how different intervals and conditions are visually depicted. This involves key concepts such as inclusive and exclusive inequalities and combinations of intervals, essential for understanding piecewise and discontinuous functions.