which is an irrational number?
√25
-31
1.414213562...
1.15
and can you tell me how you find it so i know?

Question

which is an irrational number? 
√25
-31
1.414213562...
1.15
and can you tell me how you find it so i know?

isaiah.feynman · Answer

The third is an irrational number. Its root 2.

mathstudent55 · Answer

A rational number is a number that can be written as a fraction of integers.
If a number is not rational, then it is irrational.

agent0smith · Answer

What's the square root of 25 equal to?

AN irrational number is a non-repeating decimal. There's only one there that fits that.

mathstudent55 · Answer

The above is the definition of an irrational number.

The practical way of recognizing if a number is rational or irrational is this.
If the number is written as a decimal number and it ends, or the decimal part does not end but a certain number of digits repeats forever, then the number is rational.
If the number does not end, but does not repeat, then it is irrational.

agent0smith · Answer

*AN irrational number is a non-repeating, *never ending decimal*

agent0smith · Answer

Nm, mathstudent already added that.

mathstudent55 · Answer

For example:
A) 1, 4, 24, 5.68, 9,813.769 are all rational because they all end.

B) 2.4444..., 81.99999..., 67.89898989... are all rational because even though they do not end, the same number of digits repeat for ever.

C) 3.141592654..., 2.414213562... are irrational because they don't end or repeat.