Answers edited by Júlio B.

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• How do you solve the following system?: #5x + 2y =1 , 8x-9y= 12 #
  
• Question #79c8f
  
• What is the vertex of #y=-2(x+3)^2+1 #?
  
• What is the name of #N_2O_3#?
  
• A spring with a constant of #4 (kg)/s^2# is lying on the ground with one end attached to a wall. An object with a mass of #6 kg# and speed of #5 m/s# collides with and compresses the spring until it stops moving. How much will the spring compress?
  
• How do you write "three times a number, added to 9, is 39" as a mathematical equation?
  
• What is the distance between #(8, 2) # and # (4, 7) #?
  
• How do you determine whether the given ordered pair (2, -3) is a solution of the system #x=2y+8# and #2x+y=1#?
  
• What is the equation of the line with slope # m= 6/13 # that passes through # (12,19) #?
  
• What role does ATP play in cellular function?