yes
The hyphen would be located between the mid and the century.'Mid-century'.
Yes. The prefix mid- is hyphenated when it is used with numerals or written-out numbers. For example, the mid-twentieth century.
Yes, you should hyphenate "mid-forties" when using it as an adjective to describe a range of ages, such as in "She is in her mid-forties." The hyphen helps clarify that "mid" modifies "forties" together as a single concept. However, when used as a noun without an adjective, you can write "mid forties" without the hyphen, although it is less common.
No, in general it is not correct to hyphenate certain prefixes, co-, pre-, mid-, de-, non-, anti-, etc. You therefore write preordain instead of pre-ordain, antidote instead of anti-dote, and midnight instead of mid-night.
Yes, "mid-July" is hyphenated. The hyphen is used to link "mid" and "July" to indicate that it refers to the middle part of the month. This helps clarify the meaning and ensures proper grammatical structure.
In this use of the medical terminology, "mid-left" would be correct. This is likely only an issue in a thesis or published article, as the reference is clear either way.
Don't hyphenate; ongoing is one word.
You hyphenate it only at the hyphen.
I think it's more accepted to hyphenate it.
You do not need to hyphenate.
You do not hyphenate the number.
Can you, or should you? You can hyphenate it if you're moving between lines in a paragraph and need to break up the word. You shouldn't hyphenate it normally.