Question

Which of these numbers is an irrational number?

Answer 1

Answer:

D. $\sqrt{20}$

Step-by-step explanation:

We have been given some numbers. We are asked to choose the irrational number from our given choices.

We know that a number is rational number, which can be written as a fraction. A number is irrational when it has non-terminating non-repeating decimal.

A. $\frac{3}{5}$

Since given number is fraction, so it is rational.

B. $\sqrt{4}$

$\sqrt{4}=2$

Since we can write 2 as a fraction $\frac{2}{1}$, so it is rational.

C. $\sqrt{25}$

$\sqrt{25}=5$

Since we can write 5 as a fraction $\frac{5}{1}$, so it is rational.

D. $\sqrt{20}$

$\sqrt{20}=4.47213595499$

Since the given number has non-terminating non-repeating decimal, so it is irrational.

E. $\frac{5}{3}$

Since given number is fraction, so it is rational.

Answer 2

Square root of 4 is the correct answer