Which expression is a irrational number? a. 0.78 repeating
b. square root 12 squared
c. square root 18
d. square root 169

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.

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. 

9%

Step-by-step explanation:

have a nice day :)