Firstly I would create a little recap of the info we have:

P (Adams approves) = 0.6 -> P (Baker approves) = 0.8
P (Baker reject) = 0.2

P (Adams reject) = 0.4 -> P (Baker approves) = 0.3
P (Baker rejects) = 0.7

6) We have two combinations: 1. Adams approves and Baker rejects
2. Adams rejects and Baker approves

P (1. or 2.) = P(1.) + P(2.) - each P(1.) and P(2.) has two dependent cases (approves - rejects and rejects - approves) so we use multiplication between them.

P (1. or 2.) = 0,6 * 0,2 + 0,4 * 0,3 = 0,24 and the answer is B


7) As soon as we see At least we should think about P(good) = 1 - P(bad)
P (at least one approval) = 1 - P(both reject) = 1 - 0,4 * 0,7 = 0,72

The correct answer is E