Final answer:
In Dr. Ragsdale's optimization spreadsheets, green-colored cells usually represent decision variables, which are central to optimization problems as they influence the objective function.
Step-by-step explanation:
In Dr. Ragsdale's optimization spreadsheets, cells with a green color typically represent decision variables. These are the elements within a mathematical model or spreadsheet that can be changed in order to find the best solution to the optimization problem. For example, in a linear programming model, decision variables might represent quantities to produce, to purchase, or to allocate in the most optimal way. Decision variables are the core of optimization problems as they directly influence the objective function, which is the formula that measures the quality of any given solution. However, in different spreadsheets or models, the color coding can vary, and it is always best to check the specific legend or instructions associated with that model to ensure accurate interpretation.