Calculate the angle between the vectors

Calculate the angle between the vectors:
A 6.9i-3.8j-7.0k and B = 9.0i+2.0j-6.3k.

Thanks for the help, can't quite get the right answer.

|A|=sqrt(6.9*6.9+(-3.8)*(-3.8)+(-7)(-7))…
|B|=sqrt(9*9+2*2+(-6.3)(6.3))=11.16646…
A.B=6.9*9+(-3.8)*2+(-7)(6.3)=98.6
Angle=arc cos((A.B)/(|A|*|B|)
=arc cos(98.6/(10.53*11.167))
=33.079 degree