in a class of 55 students, some study at least one of the following subjects; statistics, economics and English. 20 study none of them. The following gives further details of the subjects studied. statistics only 4, economics only 5, English only 7, all three subjects 3, statistics and English 7, economics and English 8

the answer would be c:   ax + b = ax + c

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so then what are you asking?

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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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rauschg

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