Kerin drives at a speed of 55 miles per hour on the highway for her job. Write an equation that represents the distance she travels as a function of the time she spends driving. If one day she drives for 6 hours, how many miles did she travel.

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