1. 

   math_celebrity Administrator Staff Member

   Let Janelle's age be the variable a.
   
   So twice Janelle's age is denoted as 2a.
   
   We want the sum of 13 and 2a.
   
   Sum means add.
   
   13 + 2a
   
   or
   
   2a + 13

    

   math_celebrity, Aug 24, 2016

   #1
   
   

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