To find the volume of a beach ball with a 9-inch radius, you gotta use this formula: V = (4/3)πr^3, where "r" is the radius.
Plug in 9 for "r" and solve the equation. It looks like this: V = (4/3)π(9^3).
So, the answer is 972π. That's how many cubic inches the beach ball can hold. Easy peasy, right?