John scored 75, 82, 66, and 78 on his history tests. what score must john get on his next test in order to have a mean score of 76?

In the next test John must get

Step-by-step explanation:

Let

x------> the score in the next test

we know that

The formula to calculate the mean is the sum of the scores divided by the number of test

so

Solve for x

(-5,-28)

i graphed to on desmos.

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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step-by-step explanation: