A newspaper article reports the results of an election between two candidates. The article says that Smith received 10% of the votes and that Murphy received 1 5 of the votes. A reader writes in to complain that the article cannot be accurate. What reason might the reader have to say this? If all the votes were for Smith or Murphy, then 10% plus ?% should equal ?%, but actually equals ?%.

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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