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How would a negative sign affects whether or not a number is a rational number?
It would have no effect.
Why is q represented for rational numbers not R?
R was used for Real numbers. Q, for rational numbers refers to the fact that it must be possible to express them as quotients [of two integers].
Are negative fractions a whole number?
Short answer - yes, fractions with whole numbers are rational. All whole numbers are rational. All fractions are rational. Rational numbers can be added to always make another rational number.
Is the sum of a rational number an irrational number?
The sum of just one rational number is simply itself and so it is rational. A sum normally refers to a mathematical operation on two or more numbers. Please edit the question to include more context or relevant information.
Which is an exact number?
It normally refers to a rational number that can be expressed as fraction whereas an irrational number cannot be expressed as a fraction.
