Generally speaking it is not necessary to capitalize decades unless it occurs at the start of a sentence.
You do not have to capitalize fourteen hundred dollars. The only time you would capitalize any word in that phrase is when the word "fourteen" was used at the beginning of a sentence.
I see no reason to capitalize it. In general, you capitalize something if it is the name of a single, unique thing (for example, the name of a person or country); or if something is considered sacred or otherwise important. There are a few additional cases when you capitalize something, but I don't see how any of them would apply in this case.
There are 10.6 decades. Or 10 decades plus 6 years.
No.
70 decades are in 7 centuries. It's just 10 decades per century times 7 centuries (700 years).
no, but you do capitalize mum
Capitalize the first word in a sentence. Capitalize proper nouns, such as the names of people and places. Capitalize the pronoun "I." Capitalize the first word of a quote. Capitalize days of the week, months, and holidays. Capitalize the titles of books, movies, and songs. Capitalize the first, last, and important words in titles.
No, you do not capitalize the word drama.
You capitalize the first A but not the last a.
do you capitalize roaring twenties
do you capitalize the word protestant
You capitalize Huntington
Capitalize challah bread
You would not capitalize it. cotton gin
You capitalize Judge Smith. You do not need to capitalize retired as it is not part of his title.
Yes, you always capitalize "Cuban."
yes, you do capitalize The Black Hills.