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Negative and Zero Exponents

Simpify each expression. Answers should include only positive exponents.

1. Simplify (a^-3)(b^0)
-3ab, 1/(a^3), 3a, b/(a^3)
2. Simplify x^-4
4x, 1/4 x, -4x, 1/(x^4)
3. Simplify (x^4*2x)^0
2x^5, 1/(2x^5), 1, (1/4)x^2
4. Simplify (a^0b^4)^3
a^3b^7, b^12, b^7, b^12/a^3