Double, Triple, and Change in Variables of Integrals Problems
Answer all questions. Show step by step and reasoning for questions 9 and 12. Use graph and/or drawing to help explain questions 9 and 12.

Do you only need questions 912?

I need all of the questions answered, but only need the steps and work for questions 9 and 12.

The bounty is too low for 19 problems. Even if you don't ask for an explanation, one needs to solve the problems to get the correct answer.

Very true. I am used to most of these having many multiple choice questions. I increased the bounty.

I solved 14, only 5 are left.

Solved all, please check them.
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Checked and all are correct. Thank you again.

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