Question

Which of these numbers is not rational

1. v3
2. 0.25
3. 1/5
4. z9

Answer 1

√3 is not rational

Explanation:

• A rational number is that number that can be expressed as a fraction provided its denominator is not equal to zero.

Forexample;

• √3 is irrational because it can not be expressed i to a fraction, but into a long decimal. [√3 = 1.732050....]
• 0.25 is rational because it can be expressed as a fraction
• 
  `{ \boxed{ \tt{0.25 = (25)/(100) = (5)/(20) = (1)/(4) }}}`
• 1/5 is already rational as per the definition.
• √9 is rational because it can be a fraction.
• 
  `{ \boxed{ \tt{ √(9) = 3 = (3)/(1) }}}`