The school library is planning to purchase new bookshelves. If they calculated that each bookshelf can hold 75 books and the library has 350 books already, write an equation to represent the number of books the library will have if they buy n bookshelves.

Mary is paid by the hour and gets double her hourly rate for working on Saturdays. Which algebraic expression would Mary use to calculate her pay for 35 weekday hours and 4 Saturday hours?

Let h= Mary's hourly rate. A