The second word should not be capitalized
Yes it should be capitalized.
No, "restaurant" is not capitalized in the phrase "Chinese restaurant." The only word that should be capitalized is "Chinese" in this context.
Accounts Payable should be capitalized if using the phrase as a proper noun. If not then it does not need to be capitalized.
Only "Greek" and "God" should be capitalized in the phrase "the Greek god theory."
If the phrase is a title, a proper noun, or the first word of a sentence, then it should be capitalized. Otherwise, if it is a common noun or phrase within a sentence, it may not need to be capitalized.
No; "metropolitan" is simply an adjective like any other. (Ask yourself, "Should you capitalise "rural" in the phrase "rural Illinois" or "fast" in the phrase "a fast Corvette?")
You should probably spell Colombia correctly.
The words "please," "Lindsay's," and "graduation" should be capitalized in the phrase "Please join us as we celebrate Lindsay's graduation."
Yes, "Seventh" should be capitalized in the phrase "Seventh graders" because it is part of the proper noun and specifically refers to the grade level.
Yes. The title of the monument is the "Jefferson Memorial" as a result, memorial is capitalized.
If the phrase junior (Jr) is at the end of a person's name, it is capitalized. As in Daniel Boorstin, Jr.