A linear regression line $y = -1.8x + 45$ models the relationship between daily ambient temperature $x$ (in degrees Celsius) and the volume of hot coffee sold $y$ (in gallons) at a cafe. What is the predicted change in hot coffee sales for every 5-degree Celsius increase in temperature?

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A linear regression line models the relationship between daily ambient temperature (in degrees Celsius) and the volume of hot coffee sold (in gallons) at a cafe. What is the predicted change in hot coffee sales for every 5-degree Celsius increase in temperature?

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