25 points! the expression p(1+r) represents the cost after sales tax is calculated of an item originally priced p and taxed by a rate of r. if you expand the expression, which term expresses the additional amount that you have to pay in tax? 1 r p pr

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