Translated. Hope I handled the last panel satisfactorily.

Well, no, neither of them. In the first strip, むかつく doesn't mean "helpless". In the second, the punchline is in the mismatch of informal and polite speech: Chiyo attempts to use a rough informal retort (そんなんじゃないんだ！), but ends up sticking a polite ありません in there. Very hard to render in English.

wow, why can't I see these obvious things :/ I read that as 無力[が]付いてる, where the fuck is my brain ._. And yeah, I guess you're right about the last panel :o Found some other related jokes around danbooru with the same punchline, so... yeah :) いつも正してありがとう

Hey, don't worry! We all make mistakes, it's a necessary part of learning. :-)