There is a bridge that goes over the river below the Hartford Dam.
The distance to the bottom of the bridge changes along the bridge
span. The distance at point B is three times as high as it is at point
A. The distance at point C is twice as high as it is at point A, less
20 feet. The total of these distances is 160 feet. How far from the
top of the bridge to the bottom is each point?

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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