Question

Classify each number below as a rational number or an irrational number. Not sure how to do this

Answer 1

Let us begin by defining a rational and irrational function

A rational number is a number that is expressed as the ratio of two integers, where the denominator should not be equal to zero.

An irrational number cannot be expressed in the form of fractions.

Applying the definitions, we have the solutions:

`\begin{gathered} 18\pi\text{ : irrational} \\ (15)/(20)\text{ : rational} \\ -\text{ }\sqrt[]{21}\text{ : irrational} \\ -\bar{74.81}\text{ : rational} \\ -\sqrt[]{4}\text{ : rational} \end{gathered}`