(a) Find a unit vector u from the point P = (2,5) and toward the point Q(10, 20). NOTE: Enter your answer in the form ai + bj. Enter the exact answer, or round to three decimal places. =8i+15 j X (b) Find a vector of length 85 pointing in the same direction. NOTE: Enter your answer in the form ai + bj. Enter the exact answer, or round to three decimal places. v=?i+?j X