Which inequality best describes the possible lengths of the third side of a triangle with two sides of lengths 11 and 9?

Answer 1

2<X<20

11-9=2

11+9=20

Answer 2

X+11>9 ---> x>-2 not helpful

x+9>11 ---> x>2 , helpful

9+11 > x ---> 20 > x, helpful

20 > x > 2

2 < x < 20

so the third side must be between 2 and 20, EXCLUSIVE