Question

A question about Analytical Geometry

Answer 1

Those are dot products, correct?

Answer 2

yes, they are

Answer 3

u+v+w=0, therefore one can assume that either u and v are negative, or w is negative. Assume that u and v are negative, so u.v=6, u.w=-10 and v.w=-15, so the sum is -19. Interestingly, the sum is the same if you assume that w is negative instead.

Answer 4

Sorry this isn´t the right answer