Jacob is putting 18 nonfiction and 30 fiction books on bookshelves. each shelf will have only fiction or only nonfiction, and every shelf will have the same number of books. what is the greatest number of books for each shelf, and how many shelves will there be for each book?

The lengths of two sides of a triangle are 9 and 15. what can be said about the length of the third side? a. it must be greater than or equal to 6 and less than 24. b. it must be greater than or equal to 6 and at most 24. c. it must be greater than 6 and less than 24. d. it must be greater than 6 and at most 24.