A delivery robot starts from the warehouse located at the origin W(0,0) on a coordinate grid where 1 unit represents 1 block in the city. The robot follows these instructions in order:
1. Move 6 blocks east.
2. Move 5 blocks north.
3. Move 3 blocks west.
4. Move 2 blocks south.
5. From its present position, move to a point that is 4 blocks left of the y-axis but remains at the same height (ordinate) as the current position.
Answer the following:
(a) After step 4, find the coordinates of the robot.
(b) After step 5, find the new coordinates of the robot and state the quadrant or axis on which it now lies.
(c) If the robot must return to the warehouse using the shortest possible path consisting only of movements parallel to the axes, determine a sequence of moves (east/west/north/south) and the total distance it must travel.