Can someone tell/show me how to find the volume of this?

What is the value of the expression 9+n/3-6 when n = 12? 1. 5. 7. 12.

What is the solution of log2  (3x  -  7)  =  3? 4 5

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