O, A, B are points in R2. O = (0, 0). a) Decide a point A, such that 3

0, A, B are points in R2. O = (0, 0). a) Decide a point A, such that3 < IOAI < 4. Decide a point B, such that 5 < IOBI < 6, and 500 < LAOB < 800. Hint: find IABI and use the cosine law. b) Come up with a point C, such that OA + 0B + oc = 0. c) D: (10, -8), and OD = t0A + sOB. Solve fort and s.