Please complete the questions below with a detailed explanation! Questions such as 12 and 6 need an explanation but the other questions like 10 and 4 only need partial explanation

12. Four forces of magnitude 5 N, 9 N, 10 N, and 14 N are arranged as shown in the diagram at the left. Determine the resultant of these forces.\f10. Judy and her friend Helen live on opposite sides of a river that is 1 km wide. Helen lives 2 km downstream from Judy on the opposite side of the river. Judy can swim at a rate of 3 km/h, and the river's current has a speed of 4 km/h. Judy swims from her cottage directly across the river. a. What is Judy's resultant velocity? b. How far away from Helen's cottage will Judy be when she reaches the other side? c. How long will it take Judy to reach the other side?6. A boat heads 15 west of north with a water speed of 12 m/s. Determine its resultant velocity, relative to the ground, when it encounters a 5 m/s current from 15 north of east.4. a. From the set of vectors (1, 2, -1), (-4, -5, -6), (4, 3, 10), (5, -3, - -5 6 select two pairs of vectors that are perpendicular to each other. b. Are any of these vectors collinear? Explain