Answer:
A/2 approximately
Step-by-step explanation:
The sign has two sides. She painted one of them. So that's 1/2. I said "approximately" because I assumed a 4-sided post. Maybe it is a round post and painting "one side" is possible.
8 times larger
The radius of the large sphere is double the radius of the small sphere.
7234.56 in³
4/3πr³
4/3 (3.14)(12)³