Mary selects marbles from a different bag without looking at them. This bag of marbles has 5 green marbles, 3 red marbles, and 7 blue marbles. What is the probability of her picking a red or blue marble? Write your answer in simplest form. Approximate the probability and Circle the likelihood of the event on the number line provided below.

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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