1. 

   math_celebrity Administrator Staff Member

   add 4 to the sum of 5 and z
   
   The sum of 5 and z
   5 + z
   
   Add 4 to this
   4 + (5 + z)
   
   Simplified:
   9 + z

    

   math_celebrity, Nov 15, 2016

   #1
   
   

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