What is the sum of the following four vectors in (a) unit-vector notation, and as (b) a magnitude and (c) an angle? Positive angles are counterclockwise from the positive direction of the x axis; negative angles are clockwise. A = (2.00 m )i+ (3.00 m j B = 4.00 m, at 65.0 C = ( - 4.00 m )i - (6.00 m 3 D = 5.00 m, at -2350 (a) Number -3.17 it 4.71 j Units times (b) Number 5.69 Units m (c) Number -55.9 Units (degrees)