Quiz 1

problem 1

u={1,0,5};
v={-2,6,1};
2 u
u-v
u.v
u\[Cross]v

problem 2

i=UnitVector[3,1];
j=UnitVector[3,2];
k=UnitVector[3,3];
Solve[
(18i+t j).(2i-4t j)==0,
t
]

problem 3

2 2 Sin[π/3]

Into the page.