1-3: Yes, those are correct.
4. Close, but it should be "That did the trick."
5. I'll say = (totally, I agree, exactly) However, this phrase can have a sarcastic tone when used.
For example: "Wow, it's really hot today." "I'll say!"
I'd say so = You're right; I'd agree with that; in my opinion, yes.
For example: "Do you think we should buy them a house-warming gift?" "Yeah, I'd say so."
You bet = absolutely; yes; certainly. For example: "Do you want to go to the festival?" "You bet!"
I hope this helps! :')