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• consider u = {x|x is a negative real number}. which is an empty set? {x|x ∈ u and x has a negative cube root} {x|x ∈ u and x has a negative square root} {x|x ∈ u and x is equal to the product of a positive number and –1} {x|x ∈ u and x is equal to the sum of one negative and one positive number}
  
• chelsea is graphing the function f(x) = 20(one-fourth)x. she begins by plotting the initial value. which graph represents her first step? on a coordinate plane, the point (0, 0.25) is graphed. on a coordinate plane, the point (0.25, 0) is graphed. on a coordinate plane, the point (0, 20) is graphed. on a coordinate plane, the point (20, 0) is graphed.
  
• which diagram has all the correct lines of reflectional symmetry for the rectangle?
  
• the ruling in brown v. board of education did not immediately end segregation in public schools because northern states refused to follow it. the supreme court did not offer a new policy. southern states closed all their public schools. the supreme court could not agree on a new policy.
  
• explain whether an editorial article in a newspaper, expressing the views of the editor, should be classified as a valid source of information.
  
• ben observes how quickly some dry wood is burning in a campfire. which term best relates to ben’s observation? reaction rate activation energy collision theory spontaneous reaction
  
• which equation can be rewritten as x + 4 = x2? assume x greater-than 0 startroot x endroot + 2 = x startroot x + 2 endroot = x startroot x + 4 endroot = x startroot x squared + 16 endroot = x
  
• if the discriminant of a quadratic equation is 4, which statement describes the roots?
  
• an illustration of a mass on a vertical spring with a transverse wave showing the position of the mass on the spring will make a transverse wave shape if bouncing up and down and moving horizontally. the shortest spring has the mass at the top of each crest and are labeled a and e respectively. the position where the mass in in the trough of the transverse wave would be labeled c and stretches the spring the farthest. the middle length springs has masses where the equilibrium of the material of the medium containing the transverse wave would be at the equilibrium of the material would be and are labeled b and d. at which point(s) is the net force the greatest? at which point(s) is the net force zero?
  
• in 1883, several civil rights cases came before the supreme court that were related to