Vectors : Addition, Speed and Direction

Find |a|, a + b, a ? b, 2a, and 3a + 4b.
18. a=21?3j. bi+5j
19. a=3?2k, b=i?j+k

31. A woman walks due west on the deck of a ship at 3 mi/h. The ship is moving north at a speed of 22 mi/h. Find the speed and direction of the woman relative to the surface of the water.

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