If you mean (-9 x -4)^0, then the answer it 36^0 = 1.
Otherwise, if you mean -9 x -4^0, then the answer is -9 x 1 = -9
The answers above assume that your "y" is a typo. If not, the answers are still the same:
(-9 x -4y)^0, then the answer it 36^0 = 1.
Otherwise, if you mean -9 x -4y^0, then the answer is -9 x 1 = -9
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92 * 43 = 81 * 64 = 5184
-135.
negative five
negative four
15 and -6