Vector u PQ has initial point P (3, 17) and terminal point Q (9, 2). Vector v=RS has initial point R (30, 6) and terminal point S (8, 18). Part A: Write u and v in linear form. Show all necessary work. (4 points) Part B: Write u and v in trigonometric form. Show all necessary work. (8 points) Part C: Find 7u - 4v. Show all necessary calculations. (3 points)