Lool at the photo I am confused​

I’m stuck on this i don’t understand.

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

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form