Write each percent as a fraction and as a decimal

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5