1. The problem asks to explain how a function relates one variable to another using the terms domain, range, independent variable, and dependent variable. 2. A function is a rule that assigns to each value of the (1) **independent variable** in the (2) **domain** a unique value of the (3) **dependent variable** in the (4) **range**. 3. The independent variable of a function belongs to the (1) **domain**. The dependent variable of a function belongs to the (2) **range**. This means the domain is the set of all possible input values (independent variables) you can put into the function, and the range is the set of all possible output values (dependent variables) the function can produce.