You need to calculate the total surface area of the rectangular prism. There are 6 faces total, the two on the top and the bottom will be the same while the area of the other four sides will be the same. Starting with the top and bottom, 8x8=64in^2. Now multiply this by two to get 128in^2. Now the sides will be 8x10=80in^2. Multiply this by four to get 320in^2. Now add 128in^2 plus 320in^2 to get 448in^2.
