No, numbers cannot be both.
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rational
No, it is rational.
The square root of 9 is 3 which is a rational number
Zero is a rational number, and therefore is NOT an irrational number. The definition of a rational number is any number that can be expressed as a fraction where the numerator and demoninator are both integers, and the denominator is non-zero. Irrational numbers are all real numbers that are not rational numbers. Since zero qualifies under the definition of a rational number, (0/3, for example), it therefore cannot be an irrational number.
The square root of 20 is an irrational number