Penelope invested $25,000 in a traditional IRA at a 3% annual rate when she was 35. She is now 55 and needs to withdraw the balance to buy a home. How much will she have after the 10% early withdrawal penalty and 12% income tax?

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