Final answer:
Ratios describe comparative quantities and can be expressed in various contexts such as scale distances, ternary plots, and mole ratio relationships in chemistry. They help build mental models and can be displayed or utilized in calculations to analyze and understand different relationships within a given model.
Step-by-step explanation:
To select three ratios that describe the model, let's consider different applicable contexts from the information provided. First, a ratio can be understood through scale distances or dimensions, where it compares two quantities in various forms such as fractions, colon notation, or using the word 'to'. An example is 2/3, 2:3, or '2 to 3'. Secondly, in data visualization, ratios can be depicted through ternary plots, which show the ratios of three variables within an equilateral triangle, representing a model of their relationships. Lastly, in science, particularly chemistry, ratios are crucial when dealing with the mole ratio relationship, often seen in stoichiometry within chemical reactions.
Each instance requires understanding ratios in a different context but fundamentally involves comparing quantities. Whether through graphical representation, direct comparison, or using it as a conversion factor in sequential calculations, ratios serve as a tool for understanding and comparing proportions in various scientific and mathematical models.