Which is an accurate description of rights guaranteed to blacks in the united states before the civil war? a. free blacks did not have to pay taxes but did have the duty to sit on juries. b. blacks in most of the united states had no civil or constitutional rights at all. c. black males had the same rights as all other american citizens. d. black males could vote in state elections but not in national elections.

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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a and d