Find the volume of the prism understanding measure of voulume

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

What is the sum of 25x + 15y and (-18x - 6y)

Given: pb tangent pv, pu secants if m = 80° and m = 30°, then m 3 = 55 40 25