Find the equation of the tangent line to the curve f(x) = 4x2 - 5x when the Y = 3x - 5 line is parallel to the line Find the derivative of the following. f(x) = (3x4 - 5x +27) 9 A piece of lumber at a construction site is resting against the frame of a house on a cement floor. The lumber is 4 m long. If the bottom of the lumber slides away from the wall at a rate of 0.25 m/s, how fast is the top of the lumber sliding down the wall, when the bottom of the lumber is 2 m from the wall?