The number of text messages lelah sent each month is shown in the table. she can send no more than 55 messages each month without being charged. use the inequality t < 55, where t is the number of text messages in a month, to determine in which months she exceeded her limit. if each additional text costs $0.25, how much was lelah charged from january to april?

529 and 531

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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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