Jessica purchased a dvd that was on sale for 12% off. the sales tax in her county is 3%. let y represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.

.88y +.03y = final cost or more simply .91y = final cost

100% - 12% discount leaves 88% of y (.88y)
3% tax = .03y   
.88y + .03y = .91y

Same length is comparing because it’s saying its the same and not different

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