12. Describe 3 major difficulties you had in plotting 3D (R3) points compared to plotting 2D points on the paper? Then explain whether you have found a method that makes easy for you to plot 3D points on a paper. (5 marks) 13. John can swim at 4km/h in still water. He wishes to swim across a river to a point directly opposite from where he is standing. The river is moving at a rate of 5km/h. Explain, with the use of a diagram, why this is not possible