3(x+6) what could the answer rlly be pls tell me?

Consider the graph of the exponential function y=3(2)×

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

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