Need on number 2 and 1 for the short answer plz huryy

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

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?