You're really good at investing and you have $1,500 in your investment account. you make 8.5% interest a year on your investment account! for a year you owe $1,600 on a credit card. you pay 19% interest a year on this credit card debt. answer these questions: some of the answers are incorrect. try is a hint: how much are you making on your investment? calculate: $1,500 * 8.5%. what do you pay in interest on your card? you do the math: $1,600 * 19%. looks like a huge loss of money, right? enter the loss as a negative value. how much money are you making on your investment in a year? $ how much money are you paying in interest in a year on your card? $ what's your total gain/loss that year? $ enter a negative value for a loss.

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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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