Please please help me

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

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?

With alll of except for the 2 that i did already