Answer:
A number that cannot be expressed as a fraction with the denominator other than 1.
Explanation:
For example, the number 4 is a rational number, for it can be written as 8/2.
3.33333333... is a rational number for it can be written 10/3.
HOWEVER,
IS NOT a rational number, since there is no x, y whole numbers
to write
![√(2) = (x)/(y)](https://img.qammunity.org/2021/formulas/mathematics/high-school/rl1ubw9m52wdm4r7rktubajaxeqqitr8z8.png)