Why might the ancient Egyptians have wanted to control the Nile's flood waters?

Why do boys think i'm so pretty when i'm the ugliest thing that's walked this planet

How did the rise to power and reign of alexander most affect greece

Arecent poll of 500 residents in a large town found that only 36% were in favor of a proposed referendum to build a new high school. find the margin of error for this poll if we want 95% confidence in our estimate of the percentage of residents in favor of this proposed referendum.