There are 13 books on a shelf. 4 of these books are new. what is the ratio of used books to new books? what is the ratio of all books to used books?

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

When y’all answer can y’all explain too !