Which of the following is not a composition of isometries:
a. reflection over x=2 then rotation 90 degrees clockwise about the origin
b. dilation with scale factor 1/2 then rotation 270 degrees clockwise about the origin
c. translation (x, y)-> (x-2,y+1) then reflection over the y-axis
d. reflection over the x-axis then reflection over the y-axis

B

Step-by-step explanation:

When you dilate a shape you change the size, changing the composition of isometries.

idc

step-by-step explanation:

idk

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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step-by-step explanation: