Arectangular plot of land is represented on a coordinate plane where each unit is one foot. the vertices are at (50,20), (50,90), (100,20) and (100,90). what is the perimeter of the rectangular plot?
a. 120 feet
b. 240 feet
c. 530 feet
d. 3500 feet

The correct answer is b. 240 feet!

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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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