- #1
fifaking7
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Homework Statement
A board 5 feet long slides down a wall. at the instant the bottom end is 4 feet from the wall, the other end is moving down the wall the rate of 2 feet per second.at that moment how fast is the area of the region between the board, the ground and the wall changing?
Homework Equations
a=1/2bh
The Attempt at a Solution
x^2 + 4^2= 5^2
x=3
da/dt= 1/2b(db/dt)(dh/dt)
I think i started it up wrong and I don't know where to go next..