Based on the figure below what is the value of X its a right triangle split into 25X +15 20

What is the range? can’t seem to find it out

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

What is the value of f(x) = 2.2 for f(-2)?