Final answer:
The final volume of air inside the ball after two rounds of pumping is 470 cm³, calculated by adding the initial 420 cm³ of air to the additional 50 cm³.
Step-by-step explanation:
The student has asked about the final volume of air inside a ball after it has been pumped twice. Initially, the ball has been pumped with 420 cm³ of air, then another 50 cm³ of air is added. To find the final volume of air in the ball, we simply add the two amounts of air together.
So, the calculation is as follows:
- Initial air volume: 420 cm³
- Additional air volume: 50 cm³
- Final air volume: 420 cm³ + 50 cm³ = 470 cm³
Therefore, the final volume of air inside the ball is 470 cm³.