Question #e5914

1 Answer
Hope W.
Mar 30, 2016

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.

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