12. A laptop computer was purchased for $2500. After 2 years, the value of the laptop is expected to be $1500. Give exact values in your equations below. (a) If the value of the laptop follows a linear model, express the value of the laptop as a function of the years since it was purchased. (b) If the value of the laptop follows a general exponential model, express the value of the laptop as a function of the years since it was purchased.

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