In a two-month survey of shoppers, each shopper bought one of two brands of detergent, x or y, in the first month and again bought one of these brands in the second month. in the survey, 90 percent of the shoppers who bought brand x in the first month bought brand x again in the second month, while 60 percent of the shoppers who bought brand y in the first month bought brand y again in the second month. what percent of the shoppers bought brand y in the second month?

homozygous. one is homozygous, while two is heterozygous.

4.

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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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