It would depend on where you put the parentheses.
7/9 - 9 is a rational number
7/(9-9) is not even a number at all - surely not a rational number.
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A rational number is any number that can be written as a fraction, so yes, 99 is indeed a rational number.
Yes, -0.99 is a rational number because it can be written as a fraction, -99/100. A rational number is any number that can be expressed as a fraction with an integer numerator and a non-zero integer denominator.
Irrational: it amounts to roughly 9.949874371
7divided by 2321 = 0.003015941404566997
Integers are whole numbers, with no fraction or decimal part. Rational numbers are numbers that can be expressed in the form a/b where a and b are both integers. Thus 1/2 is a rational number, but not an integer. 0.34343434... is a rational number (as it can be expressed as 34/99) but is not an integer.