How are these terms related to a circle?

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

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?