Respuesta :
Answer:
9 + X = 16
Step-by-step explanation:
Given parameters:
  Number of students on the roll  = 9
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Unknown:
The equation representing the class roster  = ?
Solution:
Let the number of additional students that joined the class = x
 Carol's class roster:
   New number of students = number of students + additional students
     16  = 9 + x
The solution of the problem is 9 + x = 16