In a certain country, the heights and depths of a road are measured in relation to sea level. Sea level has a value of 0. The lowest point of the country lies at −9 feet. The highest point of the country lies at +108 feet. Which of the following statements best describes the lowest and the highest points? The lowest point is 9 feet below sea level, and the highest point is 108 feet above sea level.
The lowest point is 9 feet above sea level, and the highest point is 108 feet below sea level.
The lowest point is 9 feet below sea level, and the highest point is 108 feet above the lowest point.
The lowest point is 9 feet above sea level, and the highest point is 108 feet below the lowest point.

A - The lowest point is 9 feet below sea level and the highest point is 108 feet above sea level.

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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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