Answer
$\frac{1}{\pi}\cdot(4^{\pi}-2^{\pi})\approx21.981$
Work Step by Step
$\int_{2}^{4} (x^{\pi-1})dx=[\frac{x^{\pi}}{\pi}]_{2}^{4}=[\frac{4^{\pi}}{\pi}]-[\frac{2^{\pi}}{\pi}]=\frac{1}{\pi}\cdot(4^{\pi}-2^{\pi})\approx21.981$
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