Yes - if you accept vectors pointing in opposite directions as "parallel". Example:
3 + 2 + (-5) = 0
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The multiplicative resultant is a three unit vector composed of a vector parallel to the 3 unit vector and a vector parallel to the product of the 3 unit and 4 unit vectors. R = (w4 + v4)(0 +v3) = (w40 - v4.v3) + (w4v3 + 0v4 + v4xv3) R = (0 - 0) + w4v3 + v4xv3 as v4.v3 =0 ( right angles or perpendicular)
Cross product also known as vector product can best be described as a binary operation on two vectors in a three-dimensional space. The created vector is perpendicular to both of the multiplied vectors.
Not sure what you mean by "missed" but the answer is 0.
Providing that it is a regular 6 sided hexagon then it will have 3 pairs of opposite parallel sides. Though an irregular hexagon (shaped as the outline of an L) can have 2 sets of three parallel sides.
for a 3x3 matrix, it can be interpreted as the volume of the hexahedron formed by three vectors (each row of the matrix as one vector).