## agentx5 3 years ago Is this correct? Q: Use the method of cylindrical shells to find the volume of the solid obtained by rotating the region bounded by the given curves about the x-axis. xy = 7, x = 0, y = 7, y = 9 A: $$\huge\int\limits_7^9 (2 \pi)(y)(\frac{y}{7}) dy = \frac{772 \pi}{21}$$

1. agentx5

|dw:1341354997885:dw|

2. TuringTest

xy=7 -> x=7/y

3. agentx5

Omg... and 28$$\pi$$ is the answer, correct. Ty much @TuringTest I can't believe I made such an easy error >_<

4. TuringTest

stupid algebra, I still don't like it much either :/

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