Amanda is placing 24 books in a bookshelf. She only places 6 books on each shelf. Which equation shows how many shelves Amanda uses to place all of the books?

Divide. write in the simplest form. 4 1/6 divided by 10

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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