a)589(\(\operatorname{cm}^3\))

b)33%

4356,3\(\operatorname{mm}^3\)

a)Bán kính quả bóng bàn là: 40 : 2 = 20 (mm) = 2 (cm)

Thể tích quả bóng bàn là:

V =\(\frac43*\pi *2^2\)

=\(33,51\) (\(\operatorname{cm}^3\) )

b)29,93(\(\operatorname{cm}^3\))

I don’t really like living in the city because it is often noisy and crowded. There are too many people, cars, and motorbikes, so the air is sometimes dirty and it’s hard to relax. The streets are always busy, and traffic jams happen almost every day. Although there are many modern buildings, shops, and schools, I still prefer a quieter place. In the countryside, the air is fresh, people are friendly, and life feels peaceful. Living in the city is convenient, but sometimes it makes me feel tired and stressed. I think I would be happier if I could live somewhere calmer and closer to nature.