Question

Which of the following is an irrational number

Answer 1

Hello there! Your answer is B.

A rational number is just a number that can be expressed as a fraction.

Let's start by simplifying each number:

A.
`-√(16)` = -4 or -4/1

B.
`√(0.4)` = 0.63245553203...

C.
`√(4)` = 2 or 2/1

D.
`√(16)` = 4 or 4/1

Out of the options given, all of them can be simplified into a fraction, except for the second one, so that means that the second one is our irrational number.