What is the quotient of -8a^8b^-2/10a^-4b^-10 in simplified form? assume a=0 b=0 a.) -4a^12b^8/5 /5 c.)a^12b^8/80 d.)a^32b^5/80

Are you sure that both a and b are zero?
I doubt it.

-8a^8b^-2/10a^-4b^-10
should surely be written as a fraction for clarity:

-8a^8b^-2
          (at least this is how I interpret your question)
10a^-4b^-10

-8a^8 divided by 10a^(-4) comes out to (-8/10)a^12, and

b^(-2) divided by b^(-10) comes out to b^8

so that your final quotient is (-4/5)(a^12)(b^8).