Final answer:
The expression 9n^12/8g^9 is already in the form with variables in the numerator, as the variable term n^12 is in the numerator and the constant term 8 is in the denominator. Therefore, no further rewriting is necessary.
Step-by-step explanation:
The expression 9n^12/8g^9 with only variables in the numerator rewritten means that we should try to write this expression in such a way that all of the variables appear in the numerator and any numbers are in the denominator. This can be achieved by using the properties of exponents, particularly the rule that states negative exponents flip the construction to the denominator, or denote a division rather than multiplication. Applying this, if we have a term with a negative exponent in the numerator, it moves to the denominator and vice versa. However, the given expression already has the variable term n^12 in the numerator and the constant term 8 in the denominator. Since there are no variables in the denominator, there's no need to apply the negative exponent rule here; this expression is already in the desired form.