how do i tackle these :

1A)

Consider the following position vectors, v=i-j and w=j-2k

find i) the angle between the above vectors

ii) a vector which perpendicular on both vectors

b) Let z=2-3j and s=1+2j find

2+z

Z^2-Z and 1+s

c) solve the following equation:

z^3 - z^2 +z = 0

amanda xx