A ladder 25 ft. long is leaning against a vertical wall. If the fulcrum of the ladder is pulled horizontally away from the wall of 3 ft/sec, how fast is the top of the ladder sliding down when the bottom is 15ft. from the wall?

Question

lgbasallote · Answer

calculus related rates?

lgbasallote · Answer

|dw:1344506410653:dw|
so the equation would be pythagorean theorem
$$r^2 = x^2 + y^2$$

anonymous · Answer

yes...time rates...actually

anonymous · Answer

same question is in "Calculus workbook for dummies"

anonymous · Answer

really? can i find that online?

lgbasallote · Answer

it says it is pulled at 3 ft/sec so |dw:1344506484331:dw|
so dx = 3 ft/s