Karim is buying wood to build a tree house. He buys several boards, as described below. • 4 boards that each measure 8 feet in length 2 boards that each measure 3 1/2 yards in length • 6 boards that each measure 18 inches in length . Each board costs $1.50 per foot of length A What is the total cost of al the boards? Show your work B. Explain how you found your answer in part A

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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