Answer:
Pt 1: 
Pt 2: θ = 
Explanation:
Part 1:


imagine the "i"and the "j" with the hat




Part 2:




θ
θ
θ = 
Hope it helps
Answer: See photo
Explanation: There are a couple of ways to use velocity in an equation in the photo.
Yes, yes, we know all of that. It certainly took you long enough to
get around to asking your question.
If
a = (14, 10.5, 0)
and
b = (4.62, 9.45, 0) ,
then, to begin with, neither vector has a z-component, and they
both lie in the x-y plane.
Their dot-product a · b = (14 x 4.62) + (10.5 x 9.45) =
(64.68) + (99.225) = 163.905 (scalar)
I feel I earned your generous 5 points just reading your treatise and
finding your question (in the last line). I shall cherish every one of them.