The expression \( 9 + -9 \) simplifies to \( 0 \). A number is considered rational if it can be expressed as the quotient of two integers, where the denominator is not zero. Since \( 0 \) can be expressed as \( \frac{0}{1} \) (or any other non-zero denominator), it is a rational number. Therefore, the result of \( 9 + -9 \) is rational.
Is the number 9 + -9 rational or irrational?
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