The line is usually taken to mean that the decimals under the line repeat. And yes, such a number is rational, since it can be converted into a fraction (with whole numerator and denominator).
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-20/14 is a rational number
yes. A rational number is defined as a number that can be written as a fraction.
Yes, 28 over 5 is a rational number. A rational number is any number that can be expressed as a fraction where the numerator and denominator are integers. In this case, 28 over 5 can be written as the fraction 28/5, where both 28 and 5 are integers. Therefore, 28 over 5 is a rational number.
above 0
No. An irrational number is any number that is not a rational number; A rational number is any number that can be expressed as one integer over another integer. negative 3 over 4 is one integer (negative 3) over another integer (4), and so is a rational number.