Awatermelon seed has the following coordinates: x = -7.3 m, y = 4.1 m, and z = 0 m. find its position vector as (a) a magnitude and (b) an angle relative to the positive direction of the x axis. if the seed is moved to the xyz coordinates (3.4 m, 0 m, 0 m), what is its displacement as (c) a magnitude and (d) an angle relative to the positive direction of the x axis? put the angles in the range (-180°, 180°].