algebra

Please help I have tried this question so many times: I cannot type out the exponents because my keyboard does not allow so I'll have to write it in verbal form I'm sorry. What is the simplified form of -9 m to the power of negative two times n to the power of 5 times 2 m to the power of -3 times n to the power of negative 6.
A -18 m to the power of 5 n
B -18/m to the fifth power n
C -18m to the sixth power/n to the power of 30
D -18 m to the power of 6 times n to the power of 30

I've tried everything

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  1. -9m^-2*n^5*2m^-3*n^-6 =
    -18m^-5*n^-1 = -18/m^5*n.

    Answer: B.

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