Answer:
21 different positive integers could be the length of the third side.
Step-by-step explanation:
By triangle inequality, the sum of two sides cannot be greater than the third.
This means that the third side is between (17-11)=6 and (17+11)=28.
How many integers are between there? You could write them out and count them!
Or!
The highest integer the third side can be is 27 and the lowest integer it can be is 7.
So 27-7+1=20+1=21.