You want to predict the total cost of your upcoming vacation with a mathematical model. You decide to use the following when building
your model: the cost of airfare, the number of nights you stay, the nightly hotel price, and how much you will spend on food. Imagine
that you already chose to go to Hawaii for 4 nights and just booked and paid for your flights and hotel. What will be the variable in your
model to predict the total cost of your upcoming vacation?
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a. The cost of airfare
b. The number of nights you stay
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c. The nightly hotel price
d. How much you will spend on food