Kim invested 2000 for two years by the end of the first year the value of the investment was 15% more than the value at the beginning of the year by the end of the second year the value of the investment was 10% more than its value at the end of the first year work out the value of the investment at the end of the second year

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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the surface area is 124cm²

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length: 4cm

width: 9cm

height:   2cm