Please help, this is timed Consider the graph and the equation of function f.
F(x)=2sin(1/2x)+1

What is the midline of the function?

A. Y= 4pi
B. Y=2
C. Y=0
D. Y=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