2(x + 4) = 2x + 8 

"free@enterprise.com" reads "Free at enterprise dot com". 

Nesting: (12[5x + y][x + 3]) 

Summer special: 200 shower units @ $42.50 

They paid me three hundred dollars ($300.00). 

Typing symbols such as $, & and @, is tiresome. 

The @ symbol is sometimes called the ape-tail, but really it is short hand for the word "at". 

Use [ ]--not brackets--when you insert a word or phrase into a quotation. 

The ampersand (&) is not correctly used in place of the word "and" in a sentence. 

Ellipsis ( ... ) or ( . . . ) is used to show that something has been omitted. 

Brackets can also indicate multiplication: 2(5) = 10 

The company is called "Brown & Jones, Solicitors". 

In HTML coding, &amp; is used for &. 

The keys [Enter] and [Shift] are used frequently. 

50% of 100 is 50. 25% of 200 is also 50. How much is 10% of 500? 

"Great Expectations" was written by Charles Dickens [1812-1870]. 

If (inp(1) and inp(2)) or (inp (3)), then (pin(4'5'6)). 

If [shift]=(true) then call=tip.exe or call=tap.exe end sub. 

Sales tax is 17.5%. Does this mean that for every $100 you spend, $17.50 is taken for no value added. 

I shall never learn & or @ or as fluently as the letter keys, as hard as I may try. 

Chording is pressing keys simultaneously, such as [Ctrl] + [Alt] + [Del] keys needed to log on to some operating systems. 

Information in parentheses (like this, for example) are often examples. 

[Ctrl] key is the Control key, which was used in the days of teletype systems with the [C] key as a system IRQ. 

(09) 55 555 could be a Finnish telephone number. 

Square brackets are often used to indicate a key; such as [enter], for example. 

Some people claim that Pascal (1623-1662) discovered the triangle of binomial coefficients. 

Chemists use square brackets to indicate concentration, so [acid] means concentration of acid. 

Isaac Newton (1642-1727) is arguably the most important physicist and mathematician in modern history. 

Surds are expressions (such as the square root of 7, or the cube root of 42) which cannot be evaluated exactly. 
