Anton bought a picnic cooler. his total bill, with tax, was $7.95. he paid 6 percent sales tax. how much did he pay for the cooler alone without the tax? the cost of an item is 100% of its price. what number goes in place of ?

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