Figure ABCD is a square. Prove BD=AC

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

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