Question

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Answer 1

Answer:

$3 for 1 book.

Step-by-step explanation:

Answer 2

Answer:

$3 for 1 book

Step-by-step explanation:

if 3 books are $9, then to find out how much only one of them costs you have to divide the money by the number of things you're buying. So if you divide 9 by 3 you get 3, so 1 book costs $3.

This also checks because if you buy one book for $3 but want to buy 3 books, you have to pay thrice the amount for the books, so you would have to pay $9 because 3 times 3 is 9