Answer:
Matt used diameter of the ball instead of Radius
Explanation:
The volume of a sphere is given as:
- 4/3πr³
- Radius, r = diameter / 2
- Given that, the diameter = 15 cm ; The Radius = 15 / 2 = 7.5 cm
⇒ Matt made an error in his calculation by failing to covert the value of the diameter given to Radius.
⇒ By dividing the diameter by 2 = 15 / 2 = 7.5, we obtain the Radius, which is what Billy did in her own calculation.