What is the significance of the $ to the US Dollars?

Answer 1

Its the label. $4.99. what would that be without the "$" sign. 4.99. 4.99 what? 4.99 bananas? 4.99 computers? The "$" sign lables that as four dollars and ninty-nine vents.

Answer 2

$ is a symbol which represents the word dollar. If you are speaking of dollars, you will see a sentence like this:

The blouse cost $30.

That means that the price in dollars is 30.00.

There are several other countries, most notably Canada and Australia, which also use dollars as their method of currency. When you are looking at US dollars, they are usually referred to as USD, while Canadian dollars are called CAD, and Australian dollars are called AUD.
So, in the above example sentence:

The blouse cost $30 USD,

The designation USD shows you that the 30 dollars referred to are US Dollars.

Other than that, the sign $ is just a symbol for the word 'dollar'. Similarly, when dealing with currency, there are other signs for other types.
The Japanese Yen is symbolized by ¥, and the British Pound Sterling is symbolized by £. They are simply symbols that tell you which currency are represented.

Answer 3

It is just a symbol accepted to represent the word Dollar. It is better to use this in terms of accounting and financial items than having to write dollars every single time.

In summation, mathematicians are some of the laziest people on the planet. I know this because in a matter of speaking; I am one.

Answer 4

Are you in kindergarten?