The Hindu-Arabic numeral system which uses the digits: 1, 2, 3, 4. 5 .... etc
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You will use the numbers pi and e (or applications which use them).
Any number that can't be expressed as a fraction is an irrational number as for example the square root of 2
It usually isn't. Scientific notation is used for very large and very small numbers, that are not normally used in your daily life. Unless your "daily life" involves work in science or engineering.
Melvil Dewey created the Dewey Decimal system. It is a classification system used by libraries, and not what is meant in the question. The decimal number system is the number system that we all use on a daily basis; it was invented by a succession of Arab and Hindu mathematicians beginning about 1400 years ago.
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