Abox of cereal measures 3 by 8 by 10 inches. the manufacturer plans to market a smaller box that measures 2 by 7 by 8 inches. by how much will the volume be reduced?

volume of original box: 3 *8 *10 = 240 cubic inches

volume of new box: 2 *7 *8 = 112 cubic inches

240 - 112 = 128

 volume is reduced by 128 cubic inches

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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answer: 0.64

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