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1. $\frac{3^{0} + 3^{- 1}}{3^{- 1} - 3^{0}}$ is simplified to = ?

A. -2

B. -1

C. 1

D. 2

Solution:

\begin{aligned} \frac{3^{0} + 3^{- 1}}{3^{- 1} - 3^{0}} \\ = \frac{1 + \frac{1}{3}}{\frac{1}{3} - 1} \\ = \frac{\frac{4}{3}}{- \frac{2}{3}} \\ = - 2 \end{aligned}

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