Final answer:
This high school level mathematics question involves understanding and interpreting functions that model the total cost of renting a vacation home based on the number of days it is rented.
Step-by-step explanation:
The subject of this question is Mathematics, specifically related to the concept of functions which shows how the total cost of renting a vacation home depends on the number of days it is rented. The function describes the relationship between two variables where one variable is dependent on the other. The dependent variable in the context of the problem is the total cost, while the independent variable is the number of days the house is rented. This type of question is typically seen at the high school level, where students are learning to interpret and create function models to represent real world situations.