50 28. Sketch the vector sum v = v1 + v2 + v3 + v4 in Figure 25(B). 51 52 3+ V1 5 V 2 VA 1 V2 X X - 3 Fi 5 V (A) (B) FIGURE 25 29. Let v = PQ, where P = (-2,5), Q = (1, -2). Which of the follow- ing vectors with the given tails and heads are equivalent to v? (a) (-3, 3), (0,4) (b) (0,0), (3,-7) (c) (-1, 2), (2, -5) (d) (4, -5), (1, 4) 30. Which of the following vectors are parallel to v = (6,9) and which point in the same direction? (a) (12, 18) (b) (3, 2) (c) (2, 3) (d) (-6, -9) (e) (-24, -27) (1) (-24, -36)