Hii can sombody pls help my with this problem thank youuu

Find the equation using the point (4,8)

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

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?