A book 28 cm tall leans against the sidewall of a bookcase. The bottom of the book starts to slide away from the wall at a rate of 2 cm/sec. How fast is the top of the book moving down the wall when the bottom of the book is 12 cm from the wall?

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Answer:

This is hard

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Answer:

[tex]\frac{3sqrt10}{10}[/tex]

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