A number cube was rolled as part of an experiment. The results are displayed in the table below. Number
1
2
3
4
5
6
Frequency
4
6
5
7
3
5

What is the best explanation of how to find the experimental probability of rolling a 3?
To find the experimental probability of rolling a three, write a ratio of the number of times three occurs to the total number of trials. Simplify if necessary.
To find the experimental probability of rolling a three, write a ratio of the total number of trials to the frequency of the number three. Simplify if necessary.
To find the experimental probability of rolling a three, write a ratio of the number three to the total number of trials. Simplify if necessary.
To find the experimental probability of rolling a three, write a ratio of the total number of trials to the number three. Simplify if necessary.

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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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