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At the band’s peak of popularity, a signed Black Diamond poster sold for . Three years later, the band was almost forgotten, and the poster was worth only .

  1. What is the annual rate of depreciation for the poster?

    An exponential function is always of the form .

  2. Write a function that will allow you to calculate how much the poster is worth after years. State the meaning of each part of the equation in the context of the problem.