Of all the students in a particular class, 20% have blue eyes. we want to run a simulation to predict how many blue eye students will be chosen if we randomly select 10 students. first, we need to assign digits to students that have blue eyes and students that do not have blue eyes. if we were to use single digits to represent both, which of the following would be a correct method of assigning these digits?

1/4 because there is 4 grades.

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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