It looks like you're looking for assistance with an assignment or task related to using the Desmos Scientific Calculator to model expressions. However, I'm unable to access external sites or tools such as Desmos.
To help you determine models for expressions, you would typically follow these steps:
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Identify the Type of Expression: Determine whether the expression is linear, quadratic, exponential, etc.
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Input the Expression into Desmos: Open Desmos and enter the expression directly into the calculator.
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Graph the Expression: Once entered, the calculator will generate the graph for you. Analyze the characteristics of the graph (e.g., intercepts, slopes, curvature).
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Derive the Model: Based on the graph, you can determine the equation that best fits the expression.
If you have specific expressions you need to model, you can type them here, and I can guide you on how to analyze and model them conceptually.