Rational numbers can be expressed as fractions whereas Irrational Numbers can't be expressed as fractions
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Such a sum is always rational.
No. If x is irrational, then x/x = 1 is rational.
The product of two rational numbers, as in this example, is always RATIONAL.However, if you mean 10 x pi, pi is irrational; the product of a rational and an irrational number is ALWAYS IRRATIONAL, except for the special case in which the rational number is zero.
yes
It is always irrational.