4. The diagram below contains the vector u, connecting (1,1,0) with (4,1,0), and the vector , connecting (1,1,0) with (1,5,0). (a) Find u x -4 -3 X-axis 3, 14 12 10 8 6 4 2 Z-axis 3 Y-axis (b) Make a sketch of u x using the diagram. Explain how your sketch helps to justify your work from part (a). 5

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