Help? It says find the Slope and name the unit rate.

How do you use the elimination method for this question? explain, because i really want to understand!

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

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