1st you would find the volume of the box. L×W×H (length times width time height) and you get 130 in. cubed. Then as a final step you would do 130 in. ÷ 1/4 = 520 cubes
If the two triangles are congruent it means that their side lengths are equal, so we can assume that x = 3x - 8 and so 2x = 8 and x = 4. Hope that helps :)
