Find the volume of the solid obtained by rotating the region about the y-axis;

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Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis.

$y=x^{-5}, y=0, x=1, x=9;$

about the $y$-axis.

How do I solve this when given four values?

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Use the method of cylindrical shells:

$$ V=2\pi\int_{1}^{9}x\frac{1}{x^5}\,dx=2\pi\int_{1}^{9}x^{-4}\,dx $$