4. A boat sails 3 km South, then 10 km Southeast. Use trigonometry to find the boat's distance and bearing from its starting point. (6 marks) 5. Convert the following vectors; (4 marks) a. 75 m/s on a bearing of 295: to Cartesian form b. [-3, -8] to direction/magnitude form 6. Express as a single vector: (4 marks) a. PS + SR b. EF - DF c. MP -QR + NM - RP 7. Demonstrate using diagrams; (4 marks) a. that vector addition is commutative ie. a + b = b + a b. that vector addition is associative ie. a + ( 7 + + 2