Answer:
the second option is solution
Step-by-step explanation:
exponents inside parentheses get multiplied by exponents outside them
so first: x^-9y^6 divided by x^12y^18
next, when dividing like terms, keep variable and subtract their exponents
-9 - 12 = -21
6 - 18 = -12
Don't leave negative exponents as answer, simplify by putting them into the denominator (where the exponents will now become positive) with 1 as numerator
