In Exercises 21-38, let u = 21 – 5j, v = -3i + 7j, and w = -i – 6j. Find each specified vector or scalar. 22. v + w 24. v - w 21. u + v 23. u - v 25. v - u 26. w - v 27. 5v 28. бv 29. -4w 30. -7w 31. 3w + 2v 32. 3u + 4v 33. 3v – 4w 34. 4w - 3v 35. 2u 37. w - ul 36. |-2u| 38. u

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