Twice a number plus 6 times the number is 72

What expression is equivalent to 42x-56y

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

Which of these triangle pairs can be mapped to each other using a single translation? cof hn