yes
It should be hyphenated.
Yes and no. The out-of-plumb wall should be hyphenated while the wall was out of plumb should not.
No, the phrase "thank you note" is typically not hyphenated when used in a sentence.
Yes, one-on-one is hyphenated. I don't know why, exactly. It just is.
The second word should not be capitalized
The phrase "to date" should not be hyphenated. It is commonly used as an adverbial phrase meaning "up until now." When used in this context, it remains as two separate words. However, if used as part of a compound adjective before a noun (e.g., "to-date information"), it can be hyphenated.
No, "attorney general" should not be hyphenated. It is a noun phrase where "attorney" serves as a modifier for "general," and in standard usage, it is written as two separate words. Hyphenation is not necessary in this case, as the phrase is widely recognized and understood without it.
No, "year long" is not hyphenated when used as an adverbial phrase, such as "The project will last year long." However, when used as a compound adjective before a noun, it should be hyphenated, as in "a year-long project."
No, the phrase "hour and a half" is not hyphenated when used in a sentence. It should be written as three separate words. However, when used as an adjective before a noun, it can be hyphenated, like in "an hour-and-a-half meeting."
I really doesn't matter, but if you're writing an essay or something, keep all words that can have hyphens, either wil hyphens or without them. My point is that you want to be consistent.
Yes, "half-page ad" should be hyphenated to show that "half" and "page" are acting together as a compound adjective to describe "ad."
Yes it should be hyphenated.