Question

Which expression equals a number that is NOT a rational number?

Answer 1

Last one

Explanation:

pi is not a rational number.

3pi × 3³ ÷ 7

81pi/7

It is not rational since 81pi is not an integer

Answer 2

• 
  `(3\pi.3^3)/(7)` is not included as a rational number !

Explanation:

Here we have , following expressions & we need to identify which of the following is not a rational number . Let's find out:

We know that , Rational Number : A number which can be expressed in form of p/q , where q is not equal to zero !

Here Expressions are:

• 
  `(3\pi . 3^3)/(7\pi)` :

Let's evaluate this expression

⇒
`(3(\pi) ( 3^3))/(7(\pi))`

⇒
`(3^4)/(7)`

Therefore , It is a rational number ! .

• 
  `(-18)/(5)` :

Let's evaluate this expression

⇒
`(-18)/(5)`

Therefore , It is a rational number ! .

• 
  `(5)/(3-7-9)` :

Let's evaluate this expression

⇒
`(5)/(3-16)`

⇒
`(-5)/(13)`

Therefore , It is a rational number ! .

• 
  `(3\pi.3^3)/(7)` :

Let's evaluate this expression

⇒
`(3\pi.3^3)/(7)`

⇒
`(\pi.3^4)/(7)`

Therefore , It is not a rational number , as pi is included ! .