Dependent quantities refer to two or more variables in a mathematical equation where the value of one variable depends on the value of the other variable. There are various synonyms for this type of relationship, including correlated variables, interdependent quantities, interconnected variables, and related variables. Each of these synonyms emphasizes the idea that the variables are connected to each other, with changes in one variable causing changes in the other variables. Understanding dependent quantities is essential in many areas of mathematics, including calculus, physics, and statistics, where it is necessary to analyze relationships between different variables and understand how they affect each other.