Atour group is going sea diving. sea level is 0 feet. the ocean floor is -18 feet. one diver is already at -11 feet . the tour guide is keeping watch on the deck at 5 feet above sea level directly above the diver. what is the distance from the tour guide to the diver?its urgent

x = 12

y = 15

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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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