how to solve?

6. If T), F) and are the standard unit basic vectors in 3-space, ) ) ) ) ) > ) ) > determinethevalueof k -(j 3k)+(i 4k)-(i 4k)8|i xkl. (Simplify without using components). (3 marks) 7. Find the torque produced by a cyclist exerting a force of 1?) = [70,30,160]N on the shaft- pedal 3 = [12,15,11]cm long. torque = de (4 marks)