Yes. I am forty years old. There are forty tons of bricks needed to build this office building.
In the King James version the word - forty - appears 157 times the word - forty's - appears once
There were forty passengers waiting in line for the next boat.
Five point Forty-Seven Percent
The dusty old California miner was referred to as a "forty niner".
You just used the word acolytes in a sentence. Even saying, "can the word acolytes be used in a sentence", you are using that word in a sentence.
The word "incidentally" can be used at the end of a sentence. You can make the sentence "This was done incidentally.".
The camera was in optimum condition even though it was forty years old.
Yes, "forty-five" needs a hyphen when used as a compound adjective before a noun or when it stands alone as a number. For example, you would write "forty-five apples" or simply "forty-five." However, when used in a sentence without a noun, such as "I have forty five," the hyphen is not necessary.
You just used it in a sentence.
This is your umpteenth request for a word to be used in a sentence.
you just used it in a sentence