Verified Answer :

An irrational number has an infinite decimal expansion that does not repeat. Numbers that have infinite decimal expansions that do not repeat cannot be expressed as the fraction of two integers.  

A rational number is any number that can be expressed as the fraction of two integers. 

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Answer:

The answer is C. Square root √18

Step-by-step explanation:

you are looking for irrational number.

if use a calculator and you see that the √18 is 4.242642687119285 is a non-terminated number and non-repeated number so its irrational

the other three is rational because you can turn them into a fraction and we don't want that.

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