Hi

Need help on the following:

1)if z is any cube root of unity then 1+z+z^2 must be.

A - 0

B - 1

C - 3

D - 0 or 3

E - 1 or 3

2) For any complex numbers z with conjugate , which of the following is not necessarily true?

A -

B - is real

C - is real

D - is real

E - is real

P.S