Suppose that a car’s worth depreciates at a constant rate.  You bought the car in 2002 for $18,000 and it is now (2007) worth $12,000.  Find a formula that relates the car’s worth and the number of years after you purchased it, then use it to determine when the car will be worthless.

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A: See the attachment

Q: 5000

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A: See the handwritten solution