Students at mills middle school are required to work a certain number of community service hours. the table shows the numbers of additional hours several students worked beyond their required hours, as well as the total numbers of hours worked. read the ordered pairs from this graph to make a table. write an equation that expresses the total hours in terms of the additional hours.

answer: all the values are within because it has a pattern that repeats from -6 to 4.

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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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