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?

A 25% decrease means the textbook keeps 100% − 25% = 75% of its value after each owner, so its value is multiplied by 0.75 each time. Starting at $85, the function is f(x) = 85(0.75)^x, which is choice A: f(x) = 85(1 − 0.25)^x.

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