Two classrooms have rectangular floors of equal area, but different perimeters. Which could be the demensions of the floors in these two classrooms

Find x & pleassse me !

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

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?