Please help me, pic provide d

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

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

Using elimination, what is -4x+2y=-12 4x+8y=-24