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Integration

Please explain how to do problem 23 on the attached scan. Answer is that the shaded region falls between 12.5 square units and 16.5 square units.
As much explanation as possible please.

Please also explain how to do 27, 28, 29 and 30 on the attached scan. As much explanation as possible. Please solve the problems. Answers to 27 is: A approx equal to S which is approx equal to 0.768 and A is approx equal to s which is approx equal to 0.518. Answer to 29 is A is approx equal to S which is approximately equal to 0.746 and A is approx equal to s which is approx equal to 0.646.

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This solution is comprised of a detailed explanation to answer is that the shaded region falls between 12.5 square units and 16.5 square units.

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