Answer:
9 ft.
Explanation:
1.
If there are 2 sides for width and 2 sides for length, you would need to add the difference from both the sides of length which would be 8.
2.
28 - 8 = 20.
So if all the sides were equal, each one would be 5 ft.
If the each length side is 4 more than the width sides, you would add 4 to 5 so each length side is 9. So the length of the porch is 9 ft.