An item costs $36. the price is increased by $15, then reduced by $15. find the percent of increase and the percent of decrease.
a) the percent of increase is about 42%, whereas the percent of decrease is about 29%.
b) both the percent of increase and the percent of decrease is about 42%.
c) both the percent of increase and the percent of decrease is about 29%.
d) the percent of increase is about 42%, whereas the percent of decrease is about 79%.

answer: 25 is the correct answer

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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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