If you need to cut a 3 ft 6 in. piece and a 7 ft 8 in. piece of steel bar, which of the
following scrap pieces can be used with the least scrap left over after the cuts?
a. 10 ft 6 in.
b. 11 ft
c. 12 ft 2 in.
d. 13 ft 1 in.

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