Question

classify the numbers as rational or irrational.
4
-5
4·-5
rational
irrational

Explanation:

Step1: Define rational numbers

A rational number can be written as $\frac{p}{q}$, where $p,q$ are integers, $q
eq0$.

Step2: Classify 4

4 is $\frac{4}{1}$, so rational.

Step3: Classify -5

-5 is $\frac{-5}{1}$, so rational.

Step4: Classify $4\cdot-5$

Calculate $4\times(-5)=-20$, which is $\frac{-20}{1}$, so rational.

Answer:

rational: 4, -5, $4\cdot-5$
irrational: (no numbers fit this category)