Answer:
4
Explanation:
The triangle inequality theorem tells us the range of a third side of a triangle if we know the other two sides. Basically you only need to know how to add and subtract.
The third side has to be less than:
11 + 7.5
that is less than 18.5.
And the third side has to be more than:
11 - 7.5
That is, more than 3.5.
"integer" just means no decimals or fractions, so round up to 4.
4 is the smallest whole number that the third side can be.