Olivia needs $36 to buy a coat. she has saved $8 and plans to work as a babysitter to earn $7 per hour. which inequality shows the minimum number of hours, n, that olivia should work as a babysitter to earn enough to buy the coat?

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