I need help with these questions the red boxes are wrong

1. 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 )7+ (3.00 m )7 B - 4.00 m, at 65.0" C = (-4.00 m )i - (6.00 m )3 D -5.00 m. at-235 (a) Number 3.16 4.69 7 Units m (b) Number 5.65 Units m (c) Number i -56.02 Units "(degrees 2 For the following three vectors, what is 2 . C . (2A x B) ? A = 3.007 + 2.00 ] - 4.00k B = - 2.007 + 4.007 + 4.00k C = 7.007 - 9.00 ] Number 528 3 Use the definition of scalar product. a . b - ab cos 0, and the fact that a . b - axbx + a,by + a,b, to calculate the angle between the two vectors given by a = 5.07 + 5.0] + 5.0k and b = 7.07 + 4.07 + 3.0k. Number 15.8 Units .(degrees) Two vectors a and b have the components, in meters, a, - 3.80, a, = 1.78, b, = 1.39, by = 4 6.15. (a) Find the angle between the directions of a and b. There are two vectors in the xy plane that are perpendicular to a and have a magnitude of 3.04 m. One, vector c , has a positive x component and the other, vector d . a negative x component. What are (b) the x component and (c) the y component of c, and (d) the x component and (e) the y component of vector d ? (a) Number i 3.04 Units "(degrees) (b) Number 1.29 Units m 5 A dot product, a cross product. We have two vectors: a =a,i +a,j 6 - 6, 1 + 6, j What is the ratio b, /b, if (a) a . b = 0and (bla x 6 =0? (a) by /b, = -# x (b) by /by = = x Edit