what is $(-1)^{-3} \cdot 1^3 + (-3)^{-5} \cdot 3^5 + (-5)^{-7} \cdot 5^7$.
\((-1)^{-3} \cdot 1^3 + (-3)^{-5} \cdot 3^5 + (-5)^{-7} \cdot 5^7\\ =-\frac{1}{1^3}\cdot1^3-\frac{1}{3^5}\cdot 3^5-\frac{1}{5^7}\cdot 5^7\\ =-1-1-1\\ \color{blue}=-3\)
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Thank you
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