Vectors are added by head to tail rule.
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resultant
by head to tail rule they are added
graphical is accurate because the vectors added are drawn according to a specified scale.
The general rule for adding vectors is to hook them together "head to tail" and then draw in a resultant vector. The resultant will have the magnitude and direction that represents the sum of the two vectors that were added.
Yes, two vectors of similar kind can be added. For example we can add a distance vector with another distance vector. But we cannot add distance vector and velocity vector.