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ryan and janelle are each driving from a different location to meet .when they each stopped for lunch at 12 noon. they called each other on their cell phones. ryan had traveled 245 miles in 3 1/2 hours .janelle had driven 260 miles in 4 hours. if ryan and janelle were originally 910 miles apart when they had started driving that morning. at what time would they meet?

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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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