The first two are correct,
(3) The pr of both being RH- is equal to the pr of the man having RH- times the pr of the women. So
You can check this answer by the fact that;
Pr. of both being RH+ is and one of each being which sums to 1.
(4) The answer is similiar as (3) except the conditional pr of being AB is 0.05.
(6) Use the same method to calculate this as was used in (5)