In 2003, the price of a certain automobile was approximately $30,600.00 with a depreciation of $2,520.00 per year. After how many years will the car's value be $15,480.00?

a) Write an equation to model the problem. Let t represent the number of years after 2003.
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b) Solve the equation to answer the question above. (Note: Include the units, in this case years.)
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You can earn partial credit on this problem.