Need the answer within 5-10 minutes ASAP!!

SOLVE FOR “r”

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

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

In an isosceles triangle, the vertex angle is 112 degrees. what is the measure of each base. a.34 b.24 c.44 d.54