Felix calculated the area of a triangle with a base of 3
inches and a height of 1.5 inches. Edith calculated the
area of a trapezoid with a height of 2 inches and parallel
bases of 4 inches and 6 inches. Their work is shown
below.
Felix's work
Edith's work:
A = 3bh
A = (b + b2)
A = 3(1.5)
A = (4 + 6)2
A = 4.5 inches
A = 20 inches?
What error did they both make in their work?
They didn't multiply by the base.
They didn't multiply by the height
They didn't multiply by one half.
They didn't use the right formula

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(x+3)(x+7)

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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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