Sally has 45 balloons. She buys 31 more balloons. How many balloons does she
have now?
A
76 balloons
B
77 balloons
C 66 balloons
D
14 balloons

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