Yes, back-to-school is hyphenated when used as an adjective phrase before a noun, such as "back-to-school shopping."
Yes, "school-age" is typically hyphenated when used as an adjective before a noun (e.g., school-age children).
"Mid back" is typically hyphenated when used as an adjective to describe the area between the upper and lower back.
Yes, "pre-school" is a hyphenated word.
Yes, "self-diagnose" is hyphenated.
No, "self-interest" is typically not hyphenated.
Yes, it should always be hyphenated.
Yes, "school-age" is typically hyphenated when used as an adjective before a noun (e.g., school-age children).
"Mid back" is typically hyphenated when used as an adjective to describe the area between the upper and lower back.
If you're using "after-school" as an adjective (e.g. I participate in an after-school program -- after-school is describing the kind of program I participate in), then it is hyphenated.If you're using "after school" as an adverb-noun phrase (e.g. Meet me after school -- after school tells when to meet me), then it is not hyphenated.
Yes, "pre-school" is a hyphenated word.
no it is not hyphenated. It isn't because you have added a prefix ( a bit that changes the meaning and goes at the front, if it is at the back, it is a suffix.)
The hyphenated non-school would be correct, but would be an unusual usage.
It is not hyphenated.
Motorcycle is not hyphenated
No it's not hyphenated.
The term for an educator can be one word, "schoolteacher."It also appears less frequently as a hyphenated form school-teacher.
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated