100 students are boarding the hogwarts express! they all have allocated seats but the 1st wizard to board sits in the wrong seat. each student then gets onto the train and takes their allocated seat if it’s available. if not, they pick a seat at random. what is the percent chance the last passenger will get his seat

Is the figure congruent? yes or no?

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex

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