I have answered your three questions.

You may ask your three questions. Did you not say your last question was about the Dwemer language?

You may ask your three questions. You said something about Dwemer artifacts?

You may ask your three questions. You want to know first about the disappearance of the Dwarves?

You already asked Baladas Demnevanni the three questions.

You have spoken with Baladas? Yes, I see. Archmagister Gothren will be pleased with these answers and will be quite interested to know that Baladas is alive and well. I should give you something... Here, take these messenger scrolls. You may find them useful.

So you have spoken with him? And what did he say? Well, no matter. I did not believe you could convince him to answer all the questions. But Archmagister Gothren will be quite interested to know that Baladas is alive and well.

Baladas Demnevanni lives in Arvs Drelen which is in Gnisis. You can use the Mages Guild teleport service to get to Ald'ruhn, and then take a Silt Strider there. Go there and ask him about the Disappearance of the Dwarves, Dwemer artifacts, and the Dwemer language. You do not have to get an answer from him, simply asking the three questions is enough.