Rational.
In mathematics, a rational number is any numberthat can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.
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Rational
Rational
The square root of 15 is an irrational number and it is about 3.873 rounded to three decimal places
'-3' is RATIONAL. IRRATIONAL numbers are those where the decimals go to inifinity AND there is no regular order in the decimal digits. e.g. pi = 3.141592..... is IRRATIONAL but 1/3 = 0.3333.... is RATIONAL. NB Both go to infinity, but '1/3' has the decimals in a regular order .
Yes, but not always. An easy example is sqrt(2) + sqrt(2) + sqrt(2) = 3sqrt(2), an irrational number. An easy counterexample is 2sqrt(2) + -sqrt(2) + -sqrt(2) = 0, which is rational.