The figure below is a net for a right rectangular prism. Its surface area is 396 cm2 and the area of some of the faces are filled in below. Find
the area of the missing faces, and the missing dimension.
7 cm
4
7 cm
6 cm
42 cm
72 cm
42 cm
72 cm
6 cm
7 cm
7 cm

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?