Lyle graphs triangle ABC on coordinate axes. He performs two transformations on this figure that result in the congruent triangle XYZ. Which series of transformations did Lyle most likely use? a translation left and then a dilation with a scale factor of 3 a dilation with a scale factor of 2.5 and then a rotation 180° counterclockwise a rotation 90° clockwise and then a reflection across the y-axis a reflection across the x-axis and then a dilation with a scale factor of 0.25​

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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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