Question

What is the answer??

Answer 1

9 < x < 21

Explanation:

Given 2 sides then the third side x is in the range

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

15 - 6 < x < 15 + 6

9 < x < 21

Answer 2

9<x<21

Cannot be equal to 15 when added