The phrase "student centric" is typically not hyphenated when used as a noun (e.g., "This approach is student centric"). However, it can be hyphenated as "student-centric" when used as an adjective before a noun (e.g., "a student-centric approach"). The choice depends on the grammatical context in which it is used.
No, the phrase "top of the line" is not hyphenated.
It should be hyphenated.
Yes, end-product is hyphenated. It is a noun and treated as one word which is hyphenated.
No.
No, the phrase "thank you note" is typically not hyphenated when used in a sentence.
Probably not.
No, "18 year old" is not hyphenated when used as a noun phrase (e.g., "He is an 18 year old"). However, when used as an adjective before a noun, it should be hyphenated as "18-year-old" (e.g., "She is an 18-year-old student"). The hyphen helps clarify that the age modifies the noun.
The noun phrase 'four week vacation' does not need to be hyphenated.
Yes, one-on-one is hyphenated. I don't know why, exactly. It just is.
Yes and no. The out-of-plumb wall should be hyphenated while the wall was out of plumb should not.
No
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