7). The displacement is how far away from the starting point the object ends up being. Since the person is running a lap, they should end up at the same place they started. The distance is given in the problem, so: a). 600 b). 0
8). To find the distance, calculate the perimeter. Since the book ends up at the original location, the displacement is zero, so a). 0 b). 14
Using the same strategy:
9a. 150 - 75 = 75 9b. 150 + 75 = 225 9c. 150 + 75 = 225 both times
