Use a tree to test whether the following argument is valid or invalid. if it is invalid, read off a counterexample. 1. d + (a b) 2. b (cvd) .. (dvb)

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

I’m still confused on how to work the percentages

Ineed to find the answer to number 2