Five things i learned in world war i.

   An explosion on the battlefield in France was heard in England. ...

   WW1 journalists risked their lives to report on the war. ...

   12 million letters were delivered to the frontline every week. ...

   Plastic surgery was invented because of WW1. ...

   The youngest British soldier in WW1 was just 12 years old.

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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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