Answer:
x= 7ft, 4 ft
Explanation:
Try some factors of 28, but make sure when using the addition or subtracting they equal to three also, like it said 3 feet shorter in the problem/
For example, 2 and 14 are factors but, 14-2 equals 12, and 2+14 equal 16, neither equal 3
But 7 and 4 are factors also and 7-4 equals 3
So its 7ft and 4ft