Vere spends $12.73 on books How much change should vere receive if he gives the clerk $20.00 draw or use bills and coins to slove

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

Evaluate cos2θ for cosθ = square root of 3/2

Icould really use some with this question.