When two variables have a negative correlation, a. when the x-variable decreases, the y-variable decreases. b. when the x-variable decreases, the y-variable increases. c. when the x-variable increases, the y-variable increases. d. more than one of the above is correct.

B. When the x-variable decreases, the y-variable increases

Step-by-step explanation:

The correlation is a quantity that is expressed in a range from-1 to +1. When the correlation is +1 indicates that the varibles have a positive correlation, then when one variable increases or decreses the other varaible will have the same change. When the correlation is -1 indicates a negative correlation then when one variable increases the other variable will have an opposite behavior.

One example of variables that have a negative correlation is the pages printed and the ink supply. Because when the pages printed increase the ink supply decrease.

439400

step-by-step explanation:

130^2 = 16900

16900*26 = 439400

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: