Answer is C. X=-11/3 x=-1. Hope this helps!
By the law of cosines, the angle

satisfies

which reduces to

which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
Answer:
C
Step-by-step explanation:
:)
X=8 would you like me to explain why?
Answer:
1. f(x,y) = (x, -y) 2. f(x,y) = (-x,y).
Step-by-step explanation:
I hope that helps