Find the volume of the parallelepiped with a vertex at the origin, and given 3 vectors parallel to its edges

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So I need to find the volume of the following parallelepiped

It's vertex or apex is the origin so that's (0, 0, 0)

and the three following vectors are parallel to 3 of its edges

  • u = (1, -2, 3)
  • v = (1, 3, 1)
  • w = (2, 1, 2)

I know that the volume is calculated by doing a cross product and a dot product, my teacher calls it a mixte product. However, that apex of (0,0,0) is really throwing me off.

I don't really get what It's given for?