Please help asap find dy/dx if f(x)=(x+1)^2x
a. 2xln(x+1)
b. 2ln(x+1)+2x/x+1
c. 2x(x+1)(2x-1)
d. (2ln(x+1)+2x/x+1)(x+1)^2x

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