The trade-in value, V, of a certain model of automobile, can be determined using the function V(x)=25000-0.25x, where x is the mileage. Which of the following statements is the best interpretation of the slope?
answer choices

The value of the car increases as the mileage increases.
The selling price of the car when it is new is $25,000.
The trade-in value of the car decreases $4 for every additional mile driven.
The trade-in value of the car decreases $1 for every additional 4 miles driven.

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