What's 4/12 reduced too

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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

Graph the system of equations. {6x−4y=−244x−8y=−32 use the line tool to graph the lines.