バナナは日本で値段が高いですか

The words are あげる, くれる and もらう, the （っ）て is the verb conjugation. あげる- when you give to others (or from the giver's perspective if you're not talking about you) くれる- when others give to you (or from the receiver's perspective if you're not talking about you) もらう- to receive All those words are neutral and don't carry any special nuance. About 「私は友達に宿題を手伝ってもらいました。」 You didn't got him to do that you received that action, if you wanted to say that you made him to do so you would say 私は友達に宿題を手伝わせました。

It means "to have" or more precisely, to own something. Ps: Next time write in Japanese

結構あいまいな問い。

Install windows IME to input japanese characthers

Yes there is. Just say 「え？」(uh?)

私の名前・・・ blablabla is the standart, textbookish anwers that they gave to learners, but in japanese like several other languages the 私 is already obvious since it's you that's talking, so the most simple way to say is simply: マディソンスタッキーです