Answer:

Step-by-step explanation:
Step 1: Determine the volume





Answer: 
5 meters. The area of the sidewalk has to be 10 meters and has to contain the 20 meter sandbox. The total area is thirty meters, so the length and width of the sidewalk is 6x5
4 children i think. since you’re halving 18 you will half the 8 as well
6 decimeters is equal to 600 millimeters
2 regular polygons can be made 4;4 regular polygons can be made 2;6 regular polygons can be made 1;8 regular polygons can be made 1