A variable
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computer iscalled deligent and versatile machine because it never filltiared like human beings
Quantity refers to an amount, value, 'how many', how much'
3.14 ( pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space
A regular polygon is a polygon whose sides are equal length and whose angles are all the same value. A non regular polygon is just the opposite of a regular polygon.
Without an equality sign it can not be considered to be an equation and the - or + value of 9x has not been given