How to use a or an before an adjective noun

How to use a or an before an adjective noun

A is used in front of words that start with consonants or vowels that sound like consonants: for example: a man, a man, a university, a hat, a European, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a one-way street, a

If an adjective and a noun are added after the article, who are the articles a and an? Why

Principle of proximity

④ When a noun is preceded by an adjective and "quite, rather, very", the indefinite article is placed after "quite, rather" and before "very"
When there are adjectives and "quiet, rather, very", are there both or only one?

There should be an adjective, and there should be one of quiet, rather, very
Example: it is quite a good book
That is rather a useful tool.
　This is a very interesting story.