Double mean to multiply.
For example: the algebra expression 2x can be written in the English Phrases like
-Double a Number
-Twice a number
-Two of a number
-Two times a number
-or the product of two and a number.
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The algebraic expression "twice a number z" can be represented as 2z. In this expression, the variable z represents the unknown number, and multiplying it by 2 gives you twice that number. This expression can be used in algebraic equations and formulas to represent scenarios where a number needs to be doubled.
3q
9x
10n
2b