Why does this sentence contain untuk
I agree that while the untuk is proper (formal and complete), it is not really necessary and in everyday speech generally excluded.
I'm sorry that neither duolingo nor i could be much of a help, but the sentence does feel odd without untuk. Even in everyday speech we'd still use untuk or buat in this kind of sentence
isnt is 'apakah' to indicate the question?
Yes it is
I think Apakah should be acceptable.