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Can numbers be rational and irrational?
It can't be both at the same time. Irrational means "not rational".
Is 12 am rational number or irrational?
12 is a rational number. Incidentally, there is no such time as 12 am or 12 pm: they are 12 noon and 12 midnight. Furthermore, if it was a time then it would not be a number (numbers do not have measurement units associated with them) and so it could not be rational.
Is the square root of an irrational number rational?
No: Let r be some irrational number; as such it cannot be represented as s/t where s and t are both non-zero integers. Assume the square root of this irrational number r was rational. Then it can be represented in the form of p/q where p and q are both non-zero integers, ie √r = p/q As p is an integer, p² = p×p is also an integer, let y = p² And as q is an integer, q² = q×q is also an integer, let x = q² The number is the square of its square root, thus: (√r)² = (p/q)² = p²/q² = y/x but (√r)² = r, thus r = y/x and is a rational number. But r was chosen to be an irrational number, which is a contradiction (r cannot be both rational and irrational at the same time, so it cannot exist). Thus the square root of an irrational number cannot be rational. However, the square root of a rational number can be irrational, eg for the rational number ½ its square root (√½) is not rational.
Does every irrational number have a 2 in its decimal expansion?
No; the only condition for qualyfing as an irrational number is that the same pattern of digits doesn't repeat over and over again, as it does with a rational number. For example, 8/7 is a rational number; the decimal expansion is 1.142857 142857 142857 ... As you see, the same pattern of digits repeats over and over. The number may start with different digits, but if after a while the same pattern repeats again and again, the number is rational.The following number is irrational: 0.101001000100001000001 ... The pattern doesn't repeat, because a zero is added every time. And, in this example, the decimal expansion doesn't contain any digits other than 0 and 1.
Do irrational numbers have the number 9?
' 9 ' can certainly be one ... or many ... of the digits in a written approximation of an irrational number. The number ' 9 ' itself is a perfectly rational number. If that doesn't answer your question, that's because I'm having a tough time understanding your question.
Is the number 2 rational or irrational or both or neither?
Integers and fractions that have integers in the numerator and denominator are rational. A number can't be rational and irrational at the same time - irrational means "not rational".
Are some rational numbers are irrational numbers?
Numbers cannot be rational and irrational at the same time.
Is 3.14 rational and irrational at the same time?
No number can be rational and irrational at the same time. 3.14 is the ratio of 314:100 and so is rational. HOWEVER, 3.14 is also a common approximation for pi, which is an irrational number. All irrational numbers have infinite, non-recurring decimals and so are often approximated by rationals.
Can numbers be rational and irrational?
It can't be both at the same time. Irrational means "not rational".
Is 3pi an irrational number?
Yes. Any time you multiply a rational number by an irrational number, you get an irrational number - unless the rational number is zero.
Can you add a rational number and an irrational number and get an irrational number?
Every time. No exceptions.
Why can't a number be both irrational and whole at the same time?
A whole number k can be written in the form k/1 where k and 1 are both integers. It can, thus, be expressed in the form of a ratio and so is rational. Since it is rational it cannot be irrational. Simple!
What number is both rational and irrational?
None. A rational number is a number that can be written as the quotient of two integers where the divisor is not zero. An irrational number is a real number that cannot be written as the quotient of two integers where the divisor is not zero. Any given real number either can or cannot be written as the quotient of two integers. If it can, it is rational. If it cannot, it is irrational. You can't be both at the same time. The square root of -1 is not a real number and it cannot be written as the quotient of two integers, so it is neither rational nor irrational.
Can a number be irrational and rational at the same time?
No they cant because that would be contradicting each other ( The numbers wont end and don't have a pattern but rational is the complete opposite)
Is 12 am rational number or irrational?
12 is a rational number. Incidentally, there is no such time as 12 am or 12 pm: they are 12 noon and 12 midnight. Furthermore, if it was a time then it would not be a number (numbers do not have measurement units associated with them) and so it could not be rational.
Is the square root of an irrational number rational?
No: Let r be some irrational number; as such it cannot be represented as s/t where s and t are both non-zero integers. Assume the square root of this irrational number r was rational. Then it can be represented in the form of p/q where p and q are both non-zero integers, ie √r = p/q As p is an integer, p² = p×p is also an integer, let y = p² And as q is an integer, q² = q×q is also an integer, let x = q² The number is the square of its square root, thus: (√r)² = (p/q)² = p²/q² = y/x but (√r)² = r, thus r = y/x and is a rational number. But r was chosen to be an irrational number, which is a contradiction (r cannot be both rational and irrational at the same time, so it cannot exist). Thus the square root of an irrational number cannot be rational. However, the square root of a rational number can be irrational, eg for the rational number ½ its square root (√½) is not rational.
Is the square root of 47 a rational number?
'47' is a prime number, so it does not have a rational square root. sqrt(47) = 6.8556546... to 9 d.p. An irrational number which cannot be converted to a quotient; that is made into a fraction. NB The square roots of prime numbers are irrational.
