Answer: x is equal to 2/3 ft.
Step-by-step explanation: Based on the given information, we can set up the following equation to solve for x:
110 ft² = (15 ft) * (x + 5 ft) + (5 ft) * 5 ft
Expanding the right side of the equation, we get:
110 ft² = 15x + 75 ft² + 25 ft²
Combining like terms on the right side, we get:
110 ft² = 15x + 100 ft²
Subtracting 100 ft² from both sides, we get:
10 ft² = 15x
Dividing both sides by 15 ft², we get:
x = 10/15 ft
Simplifying, we get:
x = 2/3 ft
Therefore, x is equal to 2/3 ft.