Final answer:
To find which equation models the relationship, generally the number of acres is the independent variable and the bushels of corn is the dependent variable, suggesting a direct proportional relationship, likely in the form of c = 45a.
Step-by-step explanation:
The question asks which equation models the relationship between the number of acres, a, and the bushels of corn, c, that Rick's farm produces. Without the specific data from the table, we cannot definitively determine the correct equation. However, typically in such a context, the number of acres would be the independent variable and the bushels of corn the dependent variable. This is because the amount of corn produced would depend on the number of acres allocated to growing corn. Thus, a reasonable assumption is that there is a direct proportional relationship between these two variables. Consequently, the equation most likely would take the form c = 45a.