1. you have a chance to buy a promissory note. natalia sandino borrowed some money from her mother, agreeing to repay her with 72 monthly payments of $350. natalia has just made her 26th monthly payment. natalia's mother offers to sell you the note, in which case you will receive the remaining payments from natalia. if you want to earn 14.5% compounded monthly, what price should you pay? a.) $12,295.63 b.) $16,969.53 c.) $12,444.20 2. you loan a friend $200 and are repaid $30 at the end of each month for the first 3 months and $120 at the end of the fourth month. what is your rate of return? a.) 18.83% b.) 70.01% c.) 5.00%

x = 23.78

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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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