If the position vector from the origin of the reference frame to the starting point of the trajectory is given by r = (-3,4,6)m, while the position vector from the origin of the reference frame to the end point of the trajectory is given by ra (7,6,13)m, 1) find the parameterization equation, 2) compute the midpoint of the trajectory, and 3) compute the distance from point A to point B using integration.