An irrational number is a number that can be expressed as an infinite decimal with no set of consecutive digits repeating itself indefinitely and that cannot be expressed as the quotient of two integers.
Therefore the answer would be D) √15 because the decimals keep going
√15 is an irrational number because it cannot be written as a fraction. The square root of 15 is a very long decimal. So, it is considered an irrational number.
