No.
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No, 0.19 is a rational number. A rational number is any number that can be expressed as a fraction where the numerator and denominator are integers, and the denominator is not zero. In this case, 0.19 can be written as 19/100, which is a fraction where both the numerator and denominator are integers.
No. The sum of an irrational number and any other [real] number is irrational.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
If an irrational number is added to, (or multiplied by) a rational number, the result will always be an irrational number.
Any irrational number will, eg √2, π, e.
Yes