Question

Just need a formula here...

Answer 1

might be:
\[\frac{ (\vec {a}\cdot \vec{b}\cdot\vec{c}) }{ ||\vec {a}\cdot \vec{b}\cdot \vec{c} || }\]

Answer 2

but id like to make sure

Answer 3

\(\large\rm \vec{PQ}\) and \(\large\rm \vec{PR}\) are two vectors in the plane, ya?
Taking their cross-product will give you a vector perpendicular to the plane.

Answer 4

Do I just subtract their components to get the combined vector PQ and PR?

Answer 5

Yes.\[\large\rm \vec{PQ}=\left<3,-1,-1\right>-\left<-3,-1,-2\right>\]

Answer 6

Thank you zep you da best!

Answer 7

I don't remember much from multi-variable Calculus.
I probably won't be able to help on many of these problems. lol :)

Answer 8

No worries, it seems pretty easy so far