This math topic helps students practice determining the domain and range of functions from visual representations on number lines. It specifically focuses on converting the information depicted on the number lines into set builder notation without using the union of sets. The questions in this topic involve interpreting single intervals on the number line, which are either open or closed, and translating these intervals into the appropriate mathematical expressions that describe either the domain or range of a function. Each problem presents two possible set notation answers for the student to choose from.