Can you please show the steps during/for your explanation? Thank you.
Surface Area...
SA = ∫(y = 0, 9) 2πx * √(1 + (dx/dy)²) dy
Use that form... You will actually get two separate functions, having the integrals of the positive and the negative expressions within 0 ≤ y ≤ 9
For the volume, use the Washer method...
V = ∫(x = 5,13) 2πx * √(16 - (x - 9)²) dx
Good luck!
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Surface Area...
SA = ∫(y = 0, 9) 2πx * √(1 + (dx/dy)²) dy
Use that form... You will actually get two separate functions, having the integrals of the positive and the negative expressions within 0 ≤ y ≤ 9
For the volume, use the Washer method...
V = ∫(x = 5,13) 2πx * √(16 - (x - 9)²) dx
Good luck!