Quickly just answer

1) Determine ab if a=6,b=4 and the angle between the vectors =3 ? A) 24 B) 12 C) 12 D) None of the above 2) If ab=0. Then the two vectors are A) Parallel vectors B) Orthogonal vectors C) None of the above 3) If a=,b=. Compute ab A) 5++11k B) 511k C) 3+211k D) None of the above 4) If u=+2+k,v=++2k. Then Proj vu= A) 65+65+610k B) 5+10k C) +k D) None of the above 5) If a=2+4+k. Then, the direction cosines of a : A) Cos=214,Cos=212,cos=211 B) Cos=216,Cos=211,Cos=214 C) Cos=212,Cos=214,cos=211 D) None of the above 6) The parametric equation of the line through the points P0(2,4,1) and P1(0,4,10) A) x=2t,y=4+8t,z=111t B) x=2+2t,y=4+8t,z=1+11t C) x=22t,y=4+8t,z=111t D) None of the above 7) Write down the equation of the plane containing the points P(4,3,1),Q(3,1,1)andR(4,2,8)