Apologies for the confusion. Let's correct the answer.
To apply the property of negative exponents, we have:
5^(-9) / 4^(-12)
Using the property a^(-n) = 1 / a^n, we can rewrite the expression as:
1 / (5^(9)) / (4^(12))
Now, to further simplify the expression, we can apply another exponent property:
(a^m) / (a^n) = a^(m-n)
Let's apply this property to simplify the expression:
1 / (5^(9)) / (4^(12)) = 1 / ((5^9) / (4^12))
To apply negative exponent property to both the numerator and denominator, we have:
1 / ( (1 / 5^9) / (1 / 4^12) )
Simplifying the expression, we can multiply the numerator and denominator by the reciprocal of the denominator:
1 / ( (5^9) / (4^12) ) = 1 * (4^12 / 5^9)
Therefore, the expression equivalent to 5^(-9) / 4^(-12) with positive exponents only is:
4^12 / 5^9