1. The problem asks to identify the dependent and independent variables in a relationship between sales revenue and advertising expense. 2. In such a context, the dependent variable is the one that depends on or is influenced by another variable. Here, sales revenue depends on the amount spent on advertising. 3. Therefore, the dependent variable is sales revenue. 4. The independent variable is the one that influences or predicts the dependent variable. Here, the advertising expense is the predictor. 5. Therefore, the independent variable is advertising expense. Final answers: - Dependent variable: sales revenue - Independent variable: advertising expense