This math topic focuses on defining the domain and range of functions using number line representations and translating these into interval notation. The problems require identifying and describing specific intervals based on graphical illustrations of number lines, which do not involve union of intervals. Each question presents a different scenario to determine either the domain or range as a closed, open, or half-open interval. This introductory topic on functions’ domain and range is aimed at solidifying foundational skills in visualizing and representing basic function characteristics through interval notation.