Mathematics, 19.11.2020 03:40, atsuedem974

9. The value of a guitar has been found to be —80y + 800, where y is the number of years since it was released.
a. By how much is the value of the guitar decreasing per
year?
b. How much was the initial value of the comic?

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9. The value of a guitar has been found to be —80y + 800, where y is the number of years since it w...