QUESTION 1 of 10: The Rule of 72 is a simple way to determine how long an investment will take to double given a fixed annual rate ol
interest. By dividing 72 by the annual rate of retum, investors obtain a rough estimate of how many years it will take for the initial
investment to duplicate itself. You want to double your initial investment of $5,000. You put your money in a high yield interest-bearing
account earning 6% per year. How long will it take to double your money?
a) 10 years
b) 12 years
C) 25 years
d) 33 years

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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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answer: it's d

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