Write 7.4 as a mixed number in simplest form

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

Extra points! find the missing dimension! need asap

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.