Which of the following equations is(are) true? 1 2x du I. -dx x² + 1 S 5.² o √u √2 1 2x II. -dx 10 √x² √x² +1 0 S Oll only O Both I and II None of them I only = 2du

Q: 31 55 46

A: The given figure is a trapezoid.

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Q: 14 21 8. 14

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Q: 22. 6. 8 F A, B 10

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Q: Find the value of a. 31 60° 55 46

A: Consider the given figure. The mid segment of the trapezoid is 231=a+46.

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Q: 18 5. 8. 6. 10

A: (4).  The given triangle is a right angles triangle.  Therefore use the pythagorus theorem: