This math topic focuses on practicing the visual representation of function domains and ranges using number lines. Specifically, it addresses how to plot inequalities on number lines, including cases where the solution consists of disjoint intervals, sometimes expressed as unions. Each problem presents an inequality or a set of inequalities and asks to match it with the correct number line representation, providing visual aids to help understand the intervals of the domains or ranges. This topic helps to enhance understanding of function behavior, a fundamental concept in algebra.