Which expression is equivalent to (20a^2 b^0 c^-4)(3a^15 b^12 c^0) for all values of a,b, and c where the expression is defined
The expression is equivalent to (20a^2 c^-4)(3a^15 b^12).
Since b^0 is equal to 1, we can remove it from the expression. Also, c^0 is equal to 1 (except when c = 0, but we're assuming the expression is defined for all values of c), so it can also be removed.
Final expression: (20a^2 c^-4)(3a^15 b^12)