You ordered some books online for you and your friends. Each book costs $13 and the store charges a flat rate for shipping of $20. Write an expression of buying n books.

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?