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The plus symbol: +
a comma
On a spreadsheet you use the * symbol rather than x as used normally in mathematics.
You would use a - to subtract a number on a spreadsheet
to see where most of your money is going
The equal sign(; ( = )
The most common use is in a formula that includes subtraction.
Generally it would still be called a spreadsheet, but it could be called a What-if spreadsheet.
An integrated program
You use a worksheet when you want to have only a single spreadsheet. You will use a workbook when you have multiple worksheets.
One is a spreadsheet program made by Lotus the other is a spreadsheet program made by Microsoft. The main difference is the way in which formulas are entered - in Excel they are preceded by the = symbol and in 1-2-3 they are preceded by the + symbol.
Excel can do any kind of spreadsheet, so the answer would be any kind of spreadsheet.