Which number is an irrational number

Square root of 15 because you don't know what know is going to go after it, unlike the others where you can guess the numbers that goes after it
Answer:
square root of 15
Step-by-step explanation:
an irrational number is a number that you cant write as a fraction. The square root of 15 is 3.87298335. This is a repeating decimal with no pattern so it is irrational because you cant write it as a fraction. Numbers like 1.25252525 is rational because it has a pattern and you can write it as a fraction.