Yes it is. Any number that can be represented as a fraction of two integers is rational. For example 2/9, -1/16, 6/1=6 and so on.
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Yes. Any rational number divided by another rational number is also rational.
17.
41/9 is a rational number because all fractions are rational numbers
If you mean 4/9 as a fraction then it is a rational number
A rational number is one such that it is "capable of being expressed as an integer or a quotient of integers, excluding zero as a denominator." So you must ask yourself: can 2.25 be expressed as a quotient of integers? In other words, can you divide one integer by another and get 2.25? The answer is yes, because 9 divided by 4 is 2.25. Therefore, 2.25 is a rational number.