i need help with this thanks :)

I Need Help With This Thanks class=

Answer :

Answer:

9 < x < 21

Step-by-step explanation:

Given 2 sides of a triangle then the 3rd side x is in the range

difference of 2 sides < x < sum of 2 sides , that is

15 - 6 < x < 15 + 6 , so

9 < x < 21

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