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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.



