Some are positive and some are negative.
No, they can be rational or irrational. The sign of a number has nothing to do with it.
Only if the negative sign is associated with an even root. In that case, the number is neither rational nor irrational, but is imaginary.
There is no specific sign. The set of irrationals can be written as R - Q.
No, it is irrational as it has no end
pi is an irrational number that is approximately equal to 3.14
No, they can be rational or irrational. The sign of a number has nothing to do with it.
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.
Only if the negative sign is associated with an even root. In that case, the number is neither rational nor irrational, but is imaginary.
No.
There is no specific sign. The set of irrationals can be written as R - Q.
No, it is irrational as it has no end
pi is an irrational number that is approximately equal to 3.14
An irrational number.
The sum of a rational and irrational number must be an irrational number.
No. The sum of an irrational number and any other [real] number is irrational.
rational * irrational = irrational.
No, 3.56 is not an irrational number. 3.56 is rational.