Nouns Followed by Numbers or Letters

In nonfiction is it a good idea to capitalize nouns that precede numbers or letters, as in:

Refer to Table 1.
He presented Exhibit A.
It happened in Chapter 4.
He stole cash from Register 2.
I liked him since Day 1.
That is illustrated in Appendix B.

If this is good, should we cap the plurals too?

Refer to Tables 1 and 2.
He presented Exhibits A and C.
It happened in Chapters 4 and 5.
He stole cash from Registers 2 and 6.
That is illustrated in Appendixes B and C.

Thanks.

 

Here's an explanation about capitalization from the Blue Book of Grammar and Punctuation (link). Not to dismiss your question here--keep posting!--but you seem to have a lot of questions that this book could help you with.

 

There is 1 Appendix.
There are 2 Appendices.

 

I have 1 appendix.

 

It depends on context. In academic papers, words like "table" and "figure" are capitalized when preceding a number (e.g., "Refer to Table 2."). In your examples, "register" and "day" would not be capitalized because they aren't functioning as proper nouns. I feel like "exhibit" could go either way; again, it depends on context.

 

In a legal document it would definitely be capitalized.