Question

Which expression is a irrational number? A. 0.78 repeating

Answer 1

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.

Answer 2

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.