Joey, who is 8 years old, is a star player for his school's basketball team. his latest shot is shown on the graph, which represents the height of the basketball as a function of the horizontal distance. the unit of measurement is feet. what is the significance of the point (0, 4) on the graph?
a) joey caught the ball from a height of 4 feet.
b) joey released the ball from a height of 4 feet.
c) joey threw the ball a horizontal distance of 4 feet.
d) the lowest point of the ball on the graph is 4 feet.

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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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