Question #e5914

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Question #e5914

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Answer 1 · 2016-03-30T02:49:51

Rational

Explanation:

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

Rational examples: $\sqrt{4}$ $sqrt(4)$ , $2.7$ $2.7$ , $128$ $128$ , $- 36$ $-36$
Irrational examples: $\sqrt{2}$ $sqrt(2)$ , $\sqrt{7}$ $sqrt(7)$ , $π$ $pi$

$- 4.2$ $-4.2$ can be expressed as the fraction $\frac{- 21}{5}$ $(-21)/5$
Therefore it is rational.

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Question #e5914

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