Originally Posted by

**maybnxtseasn** A leadder 25ft long is leaning against the wall of a hour. The base of the ladder is pulled away from the wall at a rate of 2ft/sec

(my picture isnt to scal for some reason)

|\

r | \ 25ft

| \

|----\

7ft

a.) How fast is the top of the ladder moving down the wall when it's base is 7ft from the wall?

i understand i can do pythag. theorom to get side of r which is 24 but im unsure of how to find dr/dt? do i still use pythag. theorom to solve for dr/dt? if so im unsure how to do it....any explanation would be greatfull!