Used books cost 2 point 2 5 dollars each. Which expression represents the total number of books that can be purchased for 10 dollars ?

Divide the $10 budget by the cost of each book: 10 ÷ 2.25 ≈ 4.44. Since you can buy only a whole number of books and cannot spend more than $10, round down to 4. The expression is ⌊10 ÷ 2.25⌋, choice D.

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