Yes - any integer, whether positive or negative, is rational. Rational numbers are defined as those which can be expressed as a ratio or non-recurring fraction or decimal.
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Any integer, whether positive or negative, is a rational number. It can be expressed as a fraction with a negative numerator and a denominator of 1.
No, -5 is a negative, rational number.
Negative numbers can be rational but not all negative have to be rational. It all depends if they can be put into a fraction.
The negative square of 36 is -(36*36) = -1296. It is rational.
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