The size of the bookstore is classi ed as Small, Medium and Large. A double sampling was performed to esti- mate the total sales of a certain book last month in the center county region, which has 500 bookstores. In the 100 book- stores selected randomly in the rst phase, 50 are small, 30 are medium and 20 are large. Suppose a strati ed random sample of 10 small, 6 medium and 4 large bookstores are carried out, the sales of the book title are

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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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rauschg

rauschg · hand

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answer is d chief get it right