I need help again!
A 15-ft ladder is leaning against one wall of an alley 9 ft wide. the lade slips, its top sliding down the wall, its foot sliding across the alley and striking the opposite wall at a speed of 4ft/sec. how fast is the top of the ladder falling at that instance?
calculus makes me want to cry!

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Do you agree with the diagram

i think so... i suck at calculus.

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