The inequality x < 5 represents the costs of a book at the sale.
What is an inequality?
An inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions. It is the condition of being unequal.
For the given situation,
At book sale, all books cost less than $5.
Let the books be denoted as x.
Then according to the condition,
[tex]x < 5[/tex] is the inequality.
Hence we can conclude that the inequality x < 5 represents the costs of a book at the sale.
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