What is the greatest common factor of 70 and 50?

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.

What is a country called that is technically independant but is controlled by another country

To what is the growth of civilization most clearly traced