Sara had 126 dollars to spend on 9 books. After buying them she had 18 dollars. How much did each book cost?

One of the inventors of integrated circuits observed that the number of transistors that fit on an integrated circuit will double every 24 months. what type of relationship most appropriately models this situation?

Sara can take no more than 22 pounds of luggage on a trip. her suitcase weighs 112 ounces. how many more pounds can she pack without going over the limit?

Describe how you can act financially responsible.