The Language of Algebra - Definitions

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"Pi" is a real number.
2.52 is a real, rational number.
n + 5 is an expression for “the sum of a number and five.”
3 is an irrational number.
“Twice a number divided by three” can be written as 2n - 3.
“Five decreased by twice a number” can be written as 5 - 2x.
“Ten less than a number” can be written as 10 n.
An integer is not a rational number.