There are 60 minutes in one hour. Which of these does NOT represent the number of minutes in an hour? a. y = 60x, where x represents the time in hours and y represents the time in minutes.
b. image attached
c. There are 240 minutes in 4 hours.
d. image attached

answer: a.   one is a factor of every whole number since every number is divisible by itself.

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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