a store has a sale on books. The price is 17.55 for one book, 16.70 each for 2 books, 15.85 each for 3 books, and $15 each for 4 books. If the pattern continues, how much will it cost to buy 7 books?
It would be $12.45,because it's going down by .85 cents so you would .85 times 3 which would equal $2.55, so you would subtract $15 by $2.55 which would equal the answer $12.45.
