Which number is an irrational number? a) square root of 100 b)1/8 c)-2.2675 d)exponent 3 square root of 16

1. To solve this problem, you must keep on mind the followinwg information:

 You know that, by definition, an irrational number is a number that cannot be expressed as a fraction.

 2. Therefore, the correct answer is the option D. 

 3. To verify the answer you have:

 ∛16=2.51

 As you can see, the result is 2.51 and the decimal number 2.51 cannot be expressed as a fraction.