During a 10 day period, officer mandel drove his patrol motorcycle 1320 miles. if he drove 105 miles on one day, how many miles did he average on the other days?

Mandel drove 105 miles in one day

total miles 1320 miles

1320  - 105   =   1215 miles

so mandel drove 1215 miles in 9 days

Average =    1215  / 9    = 135 miles per day

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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