An astronaut on the moon throws a baseball upward. The height of the ball in feet is given by the equation y = -2.7t2 + 30t + 65, where t is the number of seconds after the ball was thrown. What is the maximum height obtained by the ball, rounded to the nearest hundredth foot?

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answer: the anser is 3

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c- 2o is equal to 9

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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