In Exercises 21-24, find a unit vector in the direction of the given vector. 21. u = (-2, 4) 22. v = (1, -1) 23. w = -i - 2j 24. w = 5i + 5j In Exercises 25-28, find the unit vector in the direction of the given vector. Write your answer in (a) component form and (b) as a linear combination of the standard unit vectors i and j. 25. u = (2, 1) 26. u = (-3,2) 27. u = (-4,-5) 28. u = (3,-4) In Exercises 29-32, find the component form of the vector v. Solve algebraically and approximate exact answers with a calculator. Support your solution by estimating the lengths of the components of the vector in each figure and comparing with your answer. 29. 30. 14 18 550 4250 X 31. 32. 47 1080 33 1360