I am not completely sure, but I would say that the apothecary suggests that Jane go to school because he believes Jane would be happier and healthier away from Gateshead. She tells him how unhappy she is, so that is why he wants to help her.
13-6=7 or
13-7=6!
I hope this helps!
The subject is Cynthia, the verb is “is”, the predicate noun is singer, and the adjective is excellent. Hope this helps!