Multiple choice questions not sure which answer is correct, photos below:

First year university students were asked if they take any of the three courses listed in the Venn diagram. A student from this group is selected at random, what is the probability that this student takes both chemistry and Spanish? If P(A)=0.7, P(AnB)=0.2, and P(AUB)=0.8, find P(B') 0.3 O0.7 1.2 0.5