If two vectors combine in the same direction what mathematical operation would you use to find the resultant vector?

The head-to-tail rule is used to sum two vectors pointing in the same direction. (Vectors in the same direction are called collinear). The sum vector is slightly moved out of its correct position so that you can see it. For now, to determine if two vectors have the same direction look at a picture or use geometry.

a:

by the combination of an unlimited number of elements