PLEASE ANSWER ASAP 100 points

The radius of the cone is 3 in and y = 5 in. What is the volume of the cone in terms of pi?

12pi in^3
15pi in^3
8pi in^3
10pi in^3

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