Carlos is participating in a 5-day cross-country biking challenge. He biked for 48, 57, 66, and 68 miles on the first four days How many miles does he need to bike on the last day so that his average (mean) is 59 miles per day?

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