Answer:
15>x>9
Explanation:
There are two rules about triangle sides.
1) The two shortest sides must add up to a length bigger than the longest side, also known as the hypothenuse
2) The hypothenuse is the longest side of the triangle
In other words, x and 6 must add up to a number that's less than 15 because 15 is longest side, but must be more than 9. So x can be any value between 9 and 15