The annual gross domestic product (gdp) of a country is the value of all of the goods and services produced in the country during a year. during the period 1985-1999, the gross domestic product of the united states grew about 3.2% per year, measured in 1996 dollars. in 1985, the gdp was $577 billion. i what year did/or will the gdp equal $4.0 trillion?

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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