Is my teacher's answer key wrong?

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SUMMARY

The volume of the space bounded by the surface defined by z = x^2 + y^2 = 9 and the xy-plane is confirmed to be 9, contrary to the answer key which states 18. Multiple participants in the discussion, including the original poster and their group mate, reached the same conclusion of 9 after performing the calculations. This discrepancy highlights the need for careful verification of answer keys in educational settings.

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  • Familiarity with cylindrical coordinates
  • Knowledge of volume calculation for bounded regions
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  • Review the process of calculating volumes using triple integrals
  • Study the conversion between Cartesian and cylindrical coordinates
  • Practice problems involving bounded volumes in calculus
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Students preparing for calculus exams, educators verifying answer keys, and anyone interested in mastering volume calculations in multivariable calculus.

PsychonautQQ
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Homework Statement


Find the volume of the space bounded by z=x x^2+y^2=9 and below by the xy plane. I did this and got 9 and so did my group mate, but the answer key (which is often wrong) says 18. Can someone check this? we're trying to study for our test tomorrow :X
 
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I agree with 18. Pls post your working.
 

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