Answer: C. 2.5 ft
Explanation:
Use the Pythagorean Theorem a² + b² = c² where c is the hypotenuse.
In the given problem, the height = 6 and the hypotenuse = 6.5
6² + b² = 6.5²
36 + b² = 42.25
b² = 6.25
b = 2.5
The base (distance from the house) is 2.5 feet