6. Express each sum as a single vector: 1.5 a) AB - CB - DC + DE b) RS - TS - QP - RQ AB + BC + CD + DE RS+ST +PQ+OR = AE TP PT 7. In the diagram given, A is the midpoint of OF and N is the midpoint of PQ, with OB = 100. Let a = 0A and b = OF. Write the following vectors in terms of a and b. NOTE: AN = 10Q. a) AP = atb b) PB = -2a+ 6 c) QP = 2 2 a 52 d) NO = a +2b 8. Two non-parallel vectors start from the same spot. Given that la] = 8, (b) = 5, and (a + b) = 10. Determine the value of la - b]. a 8+ 5 - 10 OS cos"( 2 (8) (5 ) 2 2 cos ( 0. 1375 ) 80 2 - 6 = 82 X