I need help with a problem​

Answer these questions showing your work plz

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?