Pls me on numbers 8 and 9 and show me how u did it

Can someone me with the property questions for 12 13 and 14 plz

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Atown has a population of 12000 and grows at 3.5% every year. what will be the population after 7 years, to the nearest whole number?