Answer:
{14,28,39}
Step-by-step explanation:
By the Triangle Inequality Theorem, if given side lengths  ,
,  , and
, and  , where
, where  is the longest side of the triangle, then
 is the longest side of the triangle, then  holds true.
 holds true.
For the first set of numbers,  , so it doesn't represent the three sides of a triangle
, so it doesn't represent the three sides of a triangle
For the second set of numbers,  , so it doesn't represent the three sides of a triangle
, so it doesn't represent the three sides of a triangle
For the third set of numbers,  , so it does represent the three sides of a triangle
, so it does represent the three sides of a triangle
For the fourth set of numbers,  , so it doesn't represent the three sides of a triangle
, so it doesn't represent the three sides of a triangle