Question

Question #e5914

Answer 1

Rational

Explanation:

Rational numbers are characterized as numbers that can be expressed by `p/q`. In order for a number to be rational, it must have the ability to be expressed as a fraction.

Rational examples: `sqrt(4)`, `2.7`, `128`, `-36`
Irrational examples: `sqrt(2)`, `sqrt(7)`, `pi`

`-4.2` can be expressed as the fraction `(-21)/5`
Therefore it is rational.