The following regression model has been proposed to predict sales at a fast food outlet. 
a.What is the interpretation of 15 (the coefficient of X3) in the regression equation?
b.Predict sales for a store with 2 competitors, a population of 10,000 within one mile, and one drive-up window (give the answer in dollars).
c.Predict sales for the store with 2 competitors, a population of 10,000 within one mile, and no drive-up window (give the answer in dollars).
Definitions:
Pine Trees
Evergreen trees belonging to the genus Pinus, characterized by needle-shaped leaves; often symbolizing endurance and longevity.
Shitao
A Chinese painter and poet from the Qing Dynasty, renowned for his innovative landscape paintings and calligraphy, significantly influencing later Chinese art.
Reminiscences of Nanjing
A historical reference or literary work that reflects on the past events, culture, and landscapes of Nanjing, a significant city in Chinese history.
Qing Dynasty
The last imperial dynasty of China, lasting from 1644 to 1912, which was characterized by expansion, prosperity, and a rich cultural development.
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