Generally speaking it is not necessary to capitalize decades unless it occurs at the start of a sentence.
There are 10.6 decades. Or 10 decades plus 6 years.
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.
70 decades
There are 100 decades in a millenium
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.
In "Yours truly," you capitalize the first letter of each word if you are using it as a complimentary close in a letter, as it is a formal sign-off.
no, but you do capitalize mum
You capitalize the first A but not the last a.
In a list, you would typically capitalize the first word of each item, proper nouns, and the first word after a colon if it introduces a complete sentence.
No, you do not capitalize the word drama.
You capitalize Huntington
do you capitalize the word protestant
do you capitalize roaring twenties
Country is capitalized when it is used as part of a proper noun referring to a specific country or when it begins a sentence. For example, "I am traveling to the United States" or "Country music is popular in the southern states."
Capitalize challah bread
You would not capitalize it. cotton gin
4.5 decades equals 4.5 decades!