1. 

   math_celebrity Administrator Staff Member

   Use c for unknown variable : Sam's age plus twice his age
   
   Sam's age:
   c
   
   Twice his age means we multiply c by 2:
   2c
   
   Sam's age plus twice his age
   c + 2c

    

   math_celebrity, Aug 26, 2021

   #1
   
   

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