1. $2^{\frac{1}{x}} = 2^{\frac{1}{-0.5}} = 0.25$
2. $\frac{1}{x} = \frac{1}{-0.5} = -2$
3. $\frac{1}{x^{2}} = \frac{1}{(-0.5)^{2}} = 4$
4. $2^{x} = 2^{-0.5}=.70$
5. $\frac{1}{(-x)^\frac{1}{2}} = \frac{1}{(0.5)^\frac{1}{2}}$ = 1.41
Hence (2) $\frac{1}{x}$ is the Answer.