Y'all are going to hate me lol, ii swear this the last math one

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

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?