The denominator cannot be 0. A number with denominator 0 is not defined.
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If the denominator is 0 then the fraction is undefined.
0. Whatever the denominator - unless the denominator is also 0 in which case the fraction is undefined.
Rational expressions are fractions and are therefore undefined if the denominator is zero; the domain of a rational function is all real numbers except those that make the denominator of the related rational expression equal to 0. If a denominator contains variables, set it equal to zero and solve.
And the denominator is 0
Yes, it can be. If the numerator is 0. Then suppose the denominator is 3, which is bigger than 0 (double the numerator). So the value of the fraction is 0/3 = 0.