Answer:
25.5 < s < 38.5
Explanation:
The perimeter of a square is expressed as;
P = 4s
s is the side length of a square
If the perimeter of a square must be greater than 102, then;
p > 4s
4s > 102
s > 102/4
s > 25.5
Similarly if the perimeter of a square is less than 154 inches, then;
p < 4s
4s < 154
s < 154/4
s < 38.5
Combining both inequalitiess;
25.5 < s < 38.5
This gives the required interval