No, yes, no, yes
What part of comparing number values do you not understand? Most folks figure out enough about place value to be able to answer this by 3rd grade. If there's something about this question that really stumps you, please advise in the comments.
Recall that

where
is the angle between the vectors
whose magnitudes are
, respectively.
We have


Answer:
A)-4,8
B)-2,11
Step-by-step explanation:
A) ( -1-3)(2+5)
B) (1-3)(5+6)
Answer:
(a+b)2 = a2 + b2
Step-by-step explanation: