Question

What is an expression for vector x involving vector r, vector s, and vector t?

Answer 1

options are:

-2r - s + t
-3r + s - t
r + -3s - t
-r + s - t

Answer 2

The drawing is not perfect but I'm assuming that r, s, and t have the same measures, and that t = 3r. I tried putting another vector in the middle to get 2 triangles but I can't figure out how to get the right equation with all 3 variables.

Answer 3

@e.mccormick @whpalmer4 Think you could help me out?

Answer 4

I think \(-3r+s-t\) is the expression that makes sense here. Remember that a vector has both magnitude and direction, so \(t\ne 3r\) as they point in totally different directions (and 3r has a greater magnitude).