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9 November, 13:20

2.) The resale value of a textbook decreases by 25% with each previous owner. A new textbook is sold for $85. Which function represents the resale value of the textbook after x owners?

f (x) = 85 (1 - 0.25) ^x

f (x) = 85 (1 + 0.25) ^x

f (x) = 85 (0.25) ^x

f (x) = (85 - 0.25) ^x

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Answers (1)
  1. 9 November, 17:08
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    Given that the original value is $85, therefore at x = 1, f (x) = $85. It is given that the price decreases by 25% with each previous owner. This means that at the 2nd owner, the value is 75% of $85, which is $63.75. Finding an equation (from the choices) which fits these parameters, the answer is f (x) = 85 (1-.025) ^x (or A).
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