A trough is 32 feet long and a cross section has the shape of an isosceles trapezoid that is 32 feet wide at the top and 20 feet wide at the bottom. The trough is 8 feet deep. If the trough is filled wih water at the rate of 70 feet3feet3/hour, how fast is the water level rising when the water is 6 feet deep

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters