Answer
a) $243$
b) $-\frac{3}{4}$
Work Step by Step
a) $\frac{3^1}{3^{-4}}=3^1\cdot3^4=3^5=3\cdot3\cdot3\cdot3\cdot3=243$
b) $48(-4)^{-3}=\frac{48}{(-4)^3}=-\frac{12}{(-4)^2}=\frac{3}{-4}=-\frac{3}{4}$
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