Algebra 2 pls! i don't have much time

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

Y= 4x + 3 y = - 1 4 x - 5 what is the best description for the lines represented by the equations?

What ia the sum if the first 7 terms of the geometric series