When the numerator of any expression or fraction is zero then the result is zero because zero divided by any number is always equal to zero.
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It is equal to 0.
You do not. If you do, the expression is undefined: it has no value.
If they are both zero, the the fraction is undefined. Otherwise it means that the ratio is equal to one.
because a fraction means the numerator divided by the denominator. whenever you take zero and divide it by something you will always get zero Ex. 0/4 = 0 0/2935871238957 = 0 0/109 = 0
x does not equal -1, because if x is minus 1, x plus 1 is zero and division by zero is not defined.