I am taking a web design class and having a problem with using inline embedded external on 3 paragraphs?

Write three paragraphs
The first paragraph should use inline styles.
The second paragraph should use embedded styles.
The third paragraph should use external styles.
I don’t understand how to apply each style to its own paragraph. Please help.

In today’s world of Web 2.0, is it still acceptable to use iFrames (Inline Frames) in web design?

Specifically for parts of websites that are consistent in every page (such as a banner that has news info and stuff), and needs to be updated often, is it still o.k. to use iframes? Or are iframes almost obsolete and pointless in the world of Web 2.0?