Here a hard one it very hard π + π × π + π ÷ π=

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

If a is a nonzero real number then the reciprocal of a is

How can (square root of 25) ^2 be rewritten?