No.
Yes, They Do...
No, you simply write General Motors or whatever.
In MLA format, movie titles are italicized, not underlined. When writing about a film, you should always use italics to distinguish the title from the rest of your text. For example, you would write Inception instead of underlining it.
Genus (should be captial) species (should be lowercase) also should be underlined
There are many different standards for how to write the title of a journal article (e.g. APA, MLA, IEEE, etc.) Journal articles will be underlined when written in MLA style. They will be italic in APA style. These styles are designed so it is easy to be consistent.
When writing the names of newspapers and magazines, italicize the publication titles (e.g., The New York Times, Time). For book titles, use italics as well (e.g., To Kill a Mockingbird). When referencing other types of works like articles, short stories, or chapters, use quotation marks (e.g., "The Lottery," "The Myth of Sisyphus"). Remember to capitalize all major words in titles.
Write the value of the underlined digit in short word form 456,120,781 if the underlined number is 5?
Thirty thousand
796
if the three is underlined what would it be 5.349
Absolutely.
4 million