Lanni checks out 6 sets of books from the library. each set has the same number of books. she reads 7 of the books, and has 11 books left to read. how many books are in each set?

Amanda went into the grocery business starting with five stores. after one year, she opened two more stores. after two years, she opened two more stores than the previous year. if amanda expands her grocery business following the same pattern, which of the following graphs represents the number of stores she will own over time?