Can anybody help me please?

What are the domain and range of the function? f(x) = -4 (sqrt)x

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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